they could all be made on a 3-d printer. but what's next? homes? rockets? business exclusive, spinning it forward to 2014, the ceo and president of 3-d printing pioneer 3-d systems only here on fox business. and the markets may close at 4 p.m. eastern, but i am always on call for you. head to foxbusiness.com/oncall, sign up for claman on call. >> you're always working. liz: like you. e-mail me at two in the morning, i'll give you the top headlines, the biggest interviews. it's the most important 90 seconds of financial news after the markets close delivered right to your smartphone. stay tuned, we're coming right back. ♪ ♪ life's an adventure wh yo'. . but your erectile dysfunction - it could be a question of blood flow. cialis tadalafil for daily use helps you be rdy anytimethe mo'. you can be more confident in your ability to be ready. helpand the same cialis ise mo'. the only dly ed tablet approved to treat ed and symptoms of bph, like needing to go frequently or urgently. tell your doctor about all your medical conditns and medications, and ask if your h

printer. called stereogy lithic, which is the oldest form of 3-d printing. it is still the high- definition and best quality. avenuereason why organic , the reason why soul cycle -- tell us why those particular organizations and how you fit into their plans. >> the way we work is we solve problems. we are a turnkey solution to a design problem, which is, if someone wants a new glass bottle forbeverages, a new bike soul cycle, we are told we need 100,000 minimum. what we are great -- really good at is creating value. they know we can deliver. >> negotiators seem to have reached some kind of deals on the u.s. budget and may be easing some of the cut. staying with washington for a moment, the passage of the prohibition on plastic guns, it was because they could get through security, correct get the >> a terrifying idea -- correct? >> a terrifying idea. there were some plans on the internet that showed how to make such a device with a printer. and again, you could not make this on a desktop. you need a fairly extensive and sophisticated printer to make this stuf

the president, jennifer lawton, thinks they will be. >> they are walking out with a 3-d printer. >> reporter the printing company that acquired the company this year opening two stores in boston, and greenwich, the head of the holidays. the personal 3-d printing market is still small, only about 36,000 units sold in 2012, accounting for just 6% of total sales for the printing 3-d industry. analysts say bringing in the consumers is crucial. >> they have to innovative and innovative with products that appeal to consumers. but go to market is important, because this is a new market. so what kind of objects are consumers printing? they have over 100,000 designs available, including arms, nose, not to mention the countless items you can constant, upload or print. >> we have a 12-year-old son who is very interesting in engineering. we thought this would be perfect for him to build this. >> it is not just statesist getting in on the action, with more than two dozen consumers this year. ma prices are starting as low as $300. stratesit and 3-d have been red hot stocks for industries this year. if the

d. metal printer totaling fifteen hundred dollars this shift to three d. printers mimics the technological transition we saw happen years ago when the single bullet rifle evolved into the high powered semiautomatic so the question on the minds of many people is how do you regulate a technology that's only becoming cheaper and more accessible by the day in washington david r.t. . and now we move on to news of the national defense authorization act also known as the n.b.a. it passed in the house where it had overwhelming support with three hundred fifty yes votes and sixty nine knows the senate will take up the bill next week before its december twentieth deadline the n.b.a. is the major funding measure for the united states military the twenty fourteen bill will authorize five hundred and fifty two billion dollars in national defense spending and nearly eighty one billion for overseas contingency operations on monday of this week leaders of the house and senate armed services committee announced that they had come to a deal and incorporated a number of new p

d. metal printer totaling fifteen hundred dollars this shift to three d. printers mimics the technological transition we saw happen years ago when the single bullet rifle evolved into the high powered semiautomatic so the question on the minds of many people as how do you regulate a technology that's only becoming cheaper and more accessible by the day in washington david r t. almost everything we just talked about you guys gun policy background checks banning assault weapons are rendered pretty much drops alit with the advent of this new technology richard how will possession and regulation be affected when people are out of print three d. guns in their own homes well i'm sure that the world's terrorists are going to shiver knowing that the congress has passed an extension of the law that's that's certainly going to prevent them from developing a plastic gun i certainly understand it in terms of general application but you know you can't be a luddite about this whole thing technology is going to go away technology goes and we need to counter technology wit

they make a $2,000 3-d printer that is awesome and to use. they make a 3-d scanner that shoots lasers and makes the file the printer reads and you can print. what is important about 3-d printing technology has nothing to do with this cup although this is pretty fun to have and hold. usually they do yoda heads but this will do. melissa: this is more functional than a yoda head. >> not really. melissa: i don't have a yoda body. i can drink out of that. >> you're absolutely right. see the ridges, little ridges? this is low resolution printed company cup. the resolution of the printer causes it to have ridges f it was finer resolution printer it would be smooth. you can print in anything. you can print in wood, which is sawdust and binder together but sands and finishes like wood. print in metal. print in stainless steel. you can print in carbon fiber and print in skeltons to build human tissue on like heart valves and plastic to make custom made cast. any material you can imagine. melissa: that was a lot of different things. that is one of the ap

d. industrial printers and a glimpse of our technological future these are all the three d. printed parts that went into making this bar after getting a federal firearms license the company used a process called direct metal laser centering to produce this browning nine hundred eleven pistol the three d. printed metal gone has fired over one thousand rounds in the meantime solid concepts has manufactured its second nineteen eleven firearm solid concepts insists the stainless steel firearm they've introduced to the world can't be replicated by hobbyists these machines start at six hundred thousand and go up to a million dollars they need to be in industrial environments they require more electricity than is available in residential areas and it will be years before metal printers become available on the consumer market not exactly the world's first mini metal maker has already been created and with laser centering patterns set to expire in february it's predicted that metal desktop printers will hit the consumer market before even as the world has learned the convenience of t

d. printer. he made a couple of puzzle pieces and hen he started to make keys. >> i have constantly locked myself out of my apartment. in fact, i picked up lock pick set, just so i could block pick my way back in, and then realized hey, instead of walking all the way across town, three blocks to a lock smith to make a copy of the key, i can just print one at home. >> he realized that he could make other people's keys just by taking pictures of them on a cell phone. hi says he can now photograph any key, literally one just sitting on a bar, feed it through a printer. >> key is very simple. all you have to do is outline the shape, and as soon as you have that, you have the key. isn't the thickness important? >> it just has tock thin enough to slide it. all of these things on the side, they are are just red herrings. they just look complicated. i have a book which has the top five key types, and that covers 95% of the u.s. my hope is that people realize is that keys are terribly outdated. and these

d. printers and trying to use them as production parts as the part finished parts that go on the car and that's called additive manufacturing and that's gaining some favor in the industry now is this street legal. the orange car is not street legal because it's a first prototype and we have had it on our sanctioned racetrack or with insurance and all that but the second car though which will be white irby two will be completely street legal i i didn't see any spot for a license plate on the docket. oh you. know there's a there's a spot here there's a license plate here there you go there you didn't understand it now can you talk about the environmental impact of potential mass mass production of these cars. well car i can cars it's one thing that worries us right now there is a boat in round numbers about one billion cars in the world and when my two boys that are now twenty two and twenty when they're my age some believe there could be two point five billion cars on the world in the world so how these cars are designed is extremely serious business and we feel that they need to be small

how it is easy to make a plastic gun through a 3-d printer.e are questions, like how expensive is it. it is always good to see you. what do you make of this story? >> this is the most dangerous thing. 3-d printing is this marvelous technology that can do all kinds of things. it is a thing we need to understand. unfortunately, it is becoming associated with in the public libertarians want to make guns that can avoid metal detectors as was demonstrated and as congress and senate are now debating and trying to react to it. >> libertarians? is it rand paul we are afraid of? >> that is probably the wrong word. it as thereushing is a small anti-government group. i don't want to lump all ibertarians in. there is a small, very radical group who believe this is a good thing, that you should have the freedom and ability to make a gun that is double. -- not detectable. it is a small group, but it is a technologically able group. one person put it out there, and thousands of people downloaded his design. possibility that this could be done. there are two

it >> we have three d printers that can make plastic guns in their basement and offices. i have nothing gaining the three d printers. >> one thing about by the a tf, they want to so the metal plate or pin as part of the firing mechanism and it is not in the gun it is not use excel would be illegal, of course. >> this has chilling implications. thank you for bringing it to our attention. >> and the questions coming up on obama care and jay carner going back and forth. jay carney is taking exception. in the moan time healthcare.gov, is your personal data safe? the chairman of the house is here live to answer that question. >> we are keeping an eye on what is going on in the white house and we'll bripg you remarks from the president as soon as he makes them and what does he need to say to reassure the american people? >> the president has acknowledged that didn't communicate. >> it was a law. >> it was an opportunity to enroll in stronger plans. and the president specifically addressed that and misled people and the administration is working every day to regain credibility.

a new use for 3-d printers in japan.9 year old girl had never seen a snow flake until she felt and touched one created by a 3-d printer. teachers say it helps children expand their imagination and understanding of the world. >>> thanks for watching al jazeera america. "the stream" isment doing up next. for news updates throughout the day, head to aljazeera.com. ♪ >> i'm lisa fletcher and you're in the stream. crude intentions or a slick move for the u.s. we debate the benefits versus environmental concerns. our digital producer wajahat ali, tweet him a lot. waj, big agendas both sides. our community has big things to say about it. >> deeply polarizing,

he wants to use it to repair worn out joints with the help of the three d printer. what we do with that this god that issue is instead of going the way to bring the total ad reads like a friend. fresh issue of life issue without reading them. the quartz someday we think might be or be able to print likely that the agency. i am still in the kingston in three d five years that could be done right in the operating room thereby eliminating the need to replace diseased joints modern technology would enable the body to renew itself continually. that means people would live longer. as he challenges that i'm facing are so complex and so deep that have got to have cell biologists the book of stem cell. specialist about a half chemists and good to have the genius to understand printing technology. i have to be a generalist who brings all these people together to solve the problem. unlike the vile hackers doctors to limit can rely on funding from foundations for his percentage. for him three d printers victory not just cartilage but even organs are anything but science fiction

law outdated. >> someone in texas has published on a website a way to make plastic gun, buying a 3-d printer for less than a thousand dollars. >> reporter: under the current law, the metal can be removed from the plastic and isn't necessary to fire the weapon. schumer and others want to change that. >> we don't want to make it easy for terrorists and criminals to bring undetectable guns onto our planes and into secure environments. >> reporter: the nra says it's okay reauthorizing the bill as is, but in a statement the nra strongly opposes any expansion of the undetectable firearmsing at. alex agrees. >> if it ain't broke, don't fix it. >> reporter: the california gun dealer says the proposed changes may deter some people, but not deter criminals. >> if they want to get a gun into a place that has metal detectors, they'll find a way. >> now, the senate is expected to vote on this bill on monday. that's the day the law expires. many expect the senate will pass it as is and deal with that 3-d issue later in 2014. anne-marie? >> all right. susan mcginnis in washington, thank you, susan. >>> ove

. >> and amazing stuff you can make with a three d printer. guess what? now, anyone can do it. stay with us. during sleep train's huge year efor a limited time,dels save hundreds on tempur-pedic mattresses. get the most highly-recommended bed in america at closeout prices. plus, get interest-free financing and free same-day delivery. why wait for the new models? sleep train's year end clearance is on now. superior service, best selection, lowest price, guaranteed. ♪ sleep train ♪ your ticket to a better night's sleep ♪ >> this live picture in san jose. we believe it might have been the sound of a smash and grab robbery in a store. we'll bring information in as soon as we can cooperate. >> san francisco hoping to be chosen again as the venue for the next america's cup races. mayor ed lee submitted an opening by the today. that is what san francisco mayor hopes been the case with america's cup. this year was the first time hosting the sailing event. the fair is asking the winner to again select the bay. >> we've suffered from the lack of experience and will do better. >> saying t

what does all of this mean for the regulation of three d printers more on that later and shout. it's tuesday. it's our third eye in washington dc. i mean you're a david and you're watching our tea the united nations senior counterterrorism official is now launching an investigation into the surveillance activities of both us and uk intelligence agencies. un special repertoire than emerson announce that he would initiate an investigation an op ed he wrote that was published by the authority and any article emerson says there are five areas of contention that are worth evaluating including whether it's noted deserves whistleblower status whether his beak damage us or uk national security whether his week say the fighting me for surveillance overhaul by their british parliament was misled about the true sadness of surveillance and one of the british parliament's current intelligence oversight system is there on out. over the course of the next year. emerson is expected to be a comprehensive investigation after which will deliver a series of recommendations to the un general assembl

d. industrial printers and a glimpse of our technological future these are all the three d. printed parts that went into making this car after getting a federal firearms license the company used a process called direct metal laser centering to produce this browning nine hundred eleven pistol takes about twenty five to thirty five hours depending on the machine we put it on and what materials were grown in. this three d. printing metal gun has fired over one thousand rounds in the meantime solid concepts has manufactured its second ninety nine eleven firearm we plan on making a few more prototypes for additional testing. and we don't we don't plan on going into full production on these we can afford to sell them. at the price of be required to get our money back while the prices of many three d. printers have fallen below one thousand dollars solid concepts insists the stainless steel firearm they've introduced to the world can't be replicated by hobbyists these machines start at six hundred thousand and go up to a million dollars they need to be in. industrial environments t

the ability to make a 3-d gun requires a 3-d printer. they are so insanely expensive., there are some cheap renters that printing seizing potter and residents. there are 10,000 dollar printers that meant using colors, but they are hard to set up. if you are going to spend a quarter of a million dollars on the printer, why wouldn't you go by half dozen or 100 guns? >> i don't think there is a fear there will be a flood of 3-d guns on the market next year. the problem is they will increase in its ability, and overtime they will be able to do more of them. there has been a prototype. the possibility is you can have many more of them in the not- too-distant future. >> i feel like the level of 3-d printing companies has gotten so ridiculous. it is like fruit loops are more exciting when they are hyper loops. they are kind of crazy. stratus is at 4 billion. the company i look at, they have a $44 million market cap. they have three full-time employees and a market cap. it seems like there is so much excitement that is not there. >> what is interesting about this business is i

. >> and amazing stuff you can make with a three d printer. guess what? no >> this live picture in san jose. we believe it might have been the sound of a smash and grab robbery in a bring information in as soon as we can cooperate. >> san francisco hoping to be chosen again as the venue for the next america's cup races. mayor ed lee submitted an opening by the today. that is what san francisco mayor hopes been the case with america's cup. this year was the first time hosting the sailing event. the fair is asking the winner to again select the bay. >> we've suffered from the lack of experience and will do better. >> saying this time it won't include controversial development rights for ellison and supervisor peskin sued over aspects of the race is hoping it won't cost money >> there is no reason the people need to pave streets should subsidizing the hobby of larry ellison. bring it back. >> reporter: so far they've raised less than half. however, economic institute believes there is a big enough pay off to justify hosting again. >> we'd say yes. it's at le

d. industrial printers and a glimpse of our technological future these are all the three d. printed parts that went into making this car after getting a federal firearms license the company used a process called direct metal laser centering to produce this browning nine hundred eleven pistol with three d. printing and metal gun has fired over one thousand rounds in the meantime solid concepts has manufactured its second nineteen eleven firearm solid concepts insists the stainless steel firearm they've introduced to the world can't be replicated by hobbyists these machines start at six hundred thousand and go up to a million dollars they need to be in industrial environments they require more electricity than is available in residential areas and it will be years before metal printers become available on the consumer market not exactly the world's first mini metal maker has already been created and with laser centering patents set to expire in february it's predicted that metal desktop printers will hit the consumer market before you know it as the world has learned the conve

d. printer. but first it's been a critical week for a skull in the long lead up to the vote on independence late next year either alex salmon launched a way to document laying out what he labeled a mission statement for the nation's future or he's toast or azalea looks at the key points put forward by the pro independence movement. should scotland be an independent country it's a six war question that requires a simple yes or no but breaking a three hundred year old doing it could hardly be simple and the scots are not taking it lightly as it stands only about thirty percent of scots say they will vote for independence a figure those in the yes camp hope to increase by presenting that much anticipated white paper which a scottish national party says has the answers to all the questions about independence the prime minister david cameron and those belong to the no conferences that independence is laden with risks and problems with warnings on just about everything taxes and debt suggests. higher t

d. industrial printers and a glimpse of our technological future these are all the three d. printed parts that went into making this bar after getting a federal firearms license the company used a process called direct metal laser simpering to produce this browning nine hundred eleven pistol the three d. printed in metal gun has fired over one thousand rounds in the meantime solid concepts has manufactured its second nineteen eleven firearm solid concepts insists the stainless steel firearm they've introduced to the world can't be replicated by hobbyists these machines start at six hundred thousand and go up to a million dollars they need to be in industrial environments they require more electricity than is available in residential areas and it will be years before metal printers become available on the consumer market not exactly the world's first mini metal maker has already been created and with laser centering patents set to expire in february it's predicted that metal desktop printers will hit the consumer market before you know it as the world has learned the convenie

d. industrial printers and a glimpse of our technological future these are all the three d. printed parts that went into making this bar after getting a federal firearms license the company used a process called direct metal laser centering to produce this browning nine hundred eleven pistol the three d. printed in metal gun has fired over one thousand rounds in the meantime solid concepts has manufactured its second nineteen eleven firearm solid concepts insists the stainless steel firearm they've introduced to the world can't be replicated by hobbyists use machine started six hundred thousand and go up to a million dollars they need to be an industrial environment so they require more electricity than is available in residential areas and it will be years before metal printers become available on the consumer market not exactly the world's first mini metal maker has already been created and with laser centering patterns set to expire in february it's predicted that metal desktop printers will hit the consumer market before even as the world has learned the convenience of t

kind of hit mainstream, but certainly over the next couple of years, a lot more people will own 3-d printers down to the top five gadgets to expect next year. it is the oxford's dictionary word of the year -- we are talking about the selfie. everyone from president obama to darth vader has been snapping them. we have more on the rise of the selfie. >> i don't have a problem with the selfie. it is a natural human instinct to capture yourself in the way that you would like to be remembered. this is how artists use to survive. the walls of the met are hung with selfies. it's possible that having a camera in your pocket all the time has perverted a natural human instinct and turned it into unbearable human issa system, but if we are going to indict ourselves for that, we have to remember the role of the selfie. twitter makes you post one when you sign-up. if you do not have one on facebook, it will remind you. instagram is the house that selfies built. these are not clubs. they are companies, and they need you to selfie to make money. my facebook profile picture is me walking away from the camer

but because we can now make very creatively constructed weapons with 3-d printers, that piece of metal can be easily removed before it goes through a metal detector and still be used without the metal on the other side of the detection unit. thus, essentially erasing the benefit of having a metal component if the metal component can just be stripped out. it's a pretty simple update that we have to make here. all we have to say is that the metal piece of the gun has to be integral to the firing mechanism of the gun so that if you take the metal out to get it through a metal detector, it doesn't work on the other end. but, mr. president, we're having a hard time getting that commonsense update, just recognizing the advancement of technology, passed. in the senate and in the house of representatives. so we have these two problems. one, the underlying bill, which is still really good law even without the update, is expiring. we've got to pass it here. and, second, that we need this update to be taken care of. this isn't science fiction anymore. now, undetectable firearms have always been a

liz: let me touch upon the 3-d printers. we have had the 3-d systems, the ceo.s been at the forefront because we started doing this a year ago. most of them up more than 100 percent year-to-date. does that continue? can you venture to see whether your users will continue to be bullish? >> we skew more youngbear, it enthusiastic that have not been through the trauma, the rest of us, all the people. you know, liz. [laughter] >> you are better preserved than me, what happens is i think we are a little later. wall street has a habit of continually giving people what they want. i no longer on the stock. what you are going to see is technology solve this problem. we have all of these start-ups solving the problems. a lot of acquisitions. i think that this trend will play out, but will surprise you in 2014 is how this moves to software. one thing they in retail is the magnitude of return. americans ove returning stuff. so as we move into 3-d in the future, companies like autodesk and a lot of software-driven the 3-d software products that help drive hardware will be th

the astonishing piece of evidence that three d metal printers he's no longer a secret. so when they become a part of our households have alongside them like a and flat screen tv the people choose to physically leave the privacy of their home. looking beyond the control of the us cut the lead up when i am rt texts. the first functional printed gun was created may this year but it was a single top model made of plastic six months later was developed a fully functional metal copies of the world's most iconic and that one expert midfield notice that the biggest danger is hidden behind the ability of treaty parade of firearms to have any . it's a very universal technology that can be used in most of the boys some some good some not so good but it is alarming that the people have started printing guns i would say the most interesting is up. let's say a gun that those who look like a ton of looks like a flower vase was something else and in so that he has this ability to make things in any shape and form really defies the laws of the conventional thinking around regulating gun

all in all three d printer hooked up to the internet. this technology was developed by major ninety company. now the machine has been loaned by the university of scooping to this school for the blind. the children tell the machine what they were attacked. to see the canberra region nation merchants. the play. so many things you really know what's in it and screamed. this is the first time i've felt like people and see how i can be to one and that's why i like to touch on things the greens say the name of your data is gathered from the internet and send to the printer which then creates three d model and present. already this machine can make it nice and i for one hundred thousand different objects. erm the school says there are many things to learn children can eat in their minds. even if they know it works. nick and then be sold. come on on he didn't know what happened tonight i'm great. conan read isn't it great. she's completely burnt. so even though i often teach history and context to these students to tax so they can understand tak

, a technology overall that is miraculous. 3-d printers can create car parts at a much cheaper price, create a trachea for a baby so it can live. but they can also create plastic guns. and now technology allows them to be sold for $1,000, a little more than $1,000, so just about anyone can get one; certainly a terrorist intent on doing evil. so the ban takes on new urgency, and today there's good news and bad news. the good news is that the house of representatives has passed a bill to extend that ban for ten years. the bad news is the dangerous loophole i mentioned is still in the bill. under existing law, the law that expires tonight, you can make one of these undetectable guns perfectly legal by simply attaching a removable piece of metal to the handle, and then you could have the gun, have it be legal at the last moment when you wanted to slip it somewhere where it could be very dangerous, you remove the metal part and make the gun invisible to the metal detector. all the senator from florida and i want to do is simply require the metal piece be permanently affixed to the gun. any

. >> at 3:00 on katie, 3-d printers can chang to those who've been denied ewelcome to covered california be denied coverage because of a pre-existing condition. enroll today at coveredca.com. >> coming up at 4:00, a girl tried to raise money for new braces can launch her own small business so, why is she told begging is okay? >> on abc at 5:00, safety concerns. residents worried about natural gas flowing through a pipeline at the center of a safety battle. >> the mystery of a missing video camera has been solved in australia after it reported the thief in action. you have to see it to believe it. >> this is what rangers in the nature preserve saw and her when they watched the recording. the camera that was is the up to watch the crocodiles was stolen...by a bird known as a sea eagle that carried it 70 miles before dropping it and then check it out, the camera records the look at the thief pecking at it and posing for a selfie. we assume he posted this on facebook along with pictures of his dinner. >> who "tweeted" about it? >> that was foul play, wasn't it? >> nice one. for all of us, th

with 3-d printers able to produce plastic weapons, gun control advocates want lawmakers to go further and all weapons to include metal parts that with make them detectable. >> a man is being held on $11,000 bail charged with stealing copper worsing from the new apple 2 headquarters construction site in cupertino. the police arrested the 56-year-old on saturday from belmont. security workers reported a burglary in progress. officers fund conditioner wiring and tubing ripped from old buildings. a police dog helped track down the suspect and investigators say when he refused to come out of hiding the k-9 went in and pit him. >> sobering statistics in san jose, twice as many pedestrians have been killed. last knit there was a vigil for the 24 pedestrians killed last year in the city. they period at corner of oakland and vine where three-year-old was killed a week and a half ago, and his funeral is set if tomorrow. the group wants the city to milk greatments to traffic enforcement and pedestrian safety. this morning, oakland police are asking people to look out for stolen vehicle that has

is partly, of course, the gun industry would prefer you buy a gun from than make one through a 3 d printer not taking a position is seen as favoring this bill. that makes it easier for republicans and democrats from gun friendly areas of the country to vote yes. >> very interesting. ed o'keefe, thank you for your team. we appreciate it. >> good to be with you. >> coming up, get bety will be back for "first buzz," we're talking about the most foul mouthed states. and an interesting change to santa's reindeer flight. that's coming up next. the day we rescued riley was a truly amazing day. he was a matted mess in a small cage. so that was our first task, was getting him to wellness. without angie's list, i don't know if we could have found all the services we needed for our riley. from contractors and doctors to dog sitters and landscapers, you can find it all on angie's list. we found riley at the shelter, and found everything he needed at angie's list. join today at angieslist.com pop in the drum of any machine... ♪ ...to wash any size load. it dissolves in any temperature, even cold. tide

about this is not only is she creating something beautiful, but we can then print those on our 3-d printer. >> not every design gets printed. visitors vote for their favorites. the images receiving the most votes are transformed from computer images into physical objects. so, this actually prints out what kids have drawn in a three-dimensional shape. >> yes, it actually builds by putting layer after layer after layer. >> the objects created by the three-dimensional printer become part of the exhibit. when we return, we'll find out what the most popular exhibit is here at the museum of mathematics. >> we're touring the five most popular exhibits at the museum of mathematics. so far we have learned about fractals, musical triads, the properties of a square, and designing in three dimensions -- proof positive that math is anything but dull. >> at first i was kind of skeptical. i was like, "a museum about math." but then we came in, and it was so much fun. >> a lot of people when they hear about a museum for math may think it's boring. so, what did you think? >> i thought it was pretty cool. >