now, it's nitrogen. huh, nice and stable nitrogen. so what happens when you die, you become less and less radioactive. you are the most radioactive right now. now, if you stop breathing, you become less and less radioactive and stop breathing. every time you eat tomatoes, it's carbon, isn't right? carbon is in everything you eat. is there any food you eat that doesn't have carbon in it? okay? and some of those carbons is carbon 14. so when you die-- or when anything that breathes in, that takes in carbon 14, dies, it becomes less and less radioactive; hence, radioactive dating, carbon dating. you've heard of that before. you wanna know how old an old tree is or something like that. you need to take a little-- that being the half-life, let me give you an example. you're with your friends, you're up country. you go into an old cave. and you say, "hey, you know what i think there was people in this cave long ago." and you dig down, you find evidence of an old camp fire. and down in that campfire, you find an old ax, maybe it's a caveman'

. >> and liquid nitrogen. forget your liquid nitrogen. >> traditional cooking methods with the precision of just a tenth of a degree. >> the whole way you think about how cooking works has to change. >> he is aggressively creative. he's going 200 miles an hour so you have to keep up. >> he doesn't have any formal culinary training so you have to redesign what he does. >> when i'm asked what i do, i usually write cook, bartender, teacher, writer. that's what i usually write. >> so dave actually gets a lot more into the food science end of things. >> i own a cherokee, and it's interesting because it will reform a gel after its set. >> questions you might not normally come across, like how do i saute a particular cut of meat? >> he's a director of technology at the international culinary center in new york city. >> he's the head of the tech department here, but essentially no other culinary school has a tech department. >> he has more knowledge about cooking than i would say most chefs in the world. >> when he's

sunlight causes nitrogen dioxide, no2, to separate into nitric oxide, "no," and an oxygen atom. kolb: so ozone gets formed as a secondary pollutant. it's not emitted directly, and it's important to understand not only how much ozone is in the atmosphere, but how much of its precursor chemicals are there so we can predict what the ozone will look like as the wind blows that chemical mixture across the countryside. narrator: aerodyne's van has been deployed all over north america to help engineers and planners identify the best strategies to reduce pollutants from industries and transportation systems. kolb: we've worked with the metropolitan transit authority in new york city that runs about a third of the city's buses, to determine which types of buses emit what kinds of pollutants. so one can take the mobile lab and follow the buses as they go about their routes in the city. and as they stop and start, take on passengers, accelerate, slow down, one can see how both the particle pollutants and the gaseous pollutants they emit change. then you can take the same type of bus and pu

let me get some liquid nitrogen out to fill the glasses. >> liquid nitrogen?little. >> you should talk to my wife. got it? >> yes. >> get a little extra. dump those out, you like dumping them out, right? >> i like doing them. >> one, two, three. >> i got it on me. >> all right, now the nice thing about this is we take the tannins out of the tea. it doesn't taste too tannic. >> i would hope so. what bothers you more than that? >> alcoholic drink, it does. >> spoil the whole thing. we're going to have to wrap this up, dave. science class is over. >> i'm going to drink this. because i didn't make one of those for myself. >> thank you very much. >> thank you very much. >> interesting, thanks, sweetie. it's a good thing we've had a few drinks, because -- >> sara is warming up the crowd next door for any question they want to ask us. first, this is "today" on nbc. >>> it is time for 3, 2, 1 live with sara haines. she's at the nintendo world store. >> hey, we found our guy, it's ryan from new york. he has a question. >> i'm a refugee from the lower east side. i'm won

and liquid nitrogen, it would freeze it. well, the dots of blood are at room temperature. they do not have to be kept cool. this can be done, i think the use pcr technology and a lot of other fancy laboratory things to extract, not live virus. you can't extract live virus from a simple like that. you can't grow it in a lamp, but you can extract dna and rna to identify what was there, so that is what nathan wolfe and his people are doing. the idea being to spot the next big one at a very, very early phase before decades pass before we realized that hiv was in the human population. the idea is try and catch the next big one much earlier than that. >> how did these deadly animal viruses tend to revolve? and do you think there will be, they will continue to evolve at the rate that they have done in our recent experience of monitoring and trying to control them? >> two things to happen if you are a virus. picture yourself a virus living in a monkey in central africa. humans a coming in. they are tearing down their habitat. they're tearing down the monkeys habitat. they are kill

nitrogen oxygen and carbon monoxide. it's still possible a future test could find methane. >> millions of americans have already voted for the presidential election but most are waiting until tuesday to cast their ballots. >> meteorologist leigh glaser is up next with the accu-weather forecast. >> i'm mike shumann, raiders staged a rally against tampa ♪ just put a little bit of yourself f ♪ ♪ in everything you do [ female announcer ] add your own ingredients to hamburger helper for a fresh take on a quick, delicious meal. it's one box with hundreds of possibilities. progresso. in what world do potatoes, bacon and cheese add up to 100 calories? your world. ♪ [ whispers ] real bacon... creamy cheese... 100 calories... [ chef ] ma'am [ male announcer ] progresso. you gotta taste this soup. >> ama: we are two days from the presidential election. candidates are full campaign mode. they are crisscrossing the country in a last minute effort to sway undecided voters. >> reporter: four years ago today it was election night and th

craig: liquid nitrogen. geoff, could you translate? >> question finally understand what you're saying. it's wonderful. [laughter] craig: alton brown, geoff peterson. good night, everybody. good night. [cheers and applause] >> this is 9 news now. >> the presidential candidates are out tonight. some maryland vet years trying to avoid long lines on tuesday found themselves in long lines this city and that is where we found them too. >> reporter: there was early voting in 2010 too but the number of early voters has already more than doubled the total number of early voters then. speaking of election history and how it repeats itself, 50 years ago last night there was this. >> next tuesday, november 6, is election day. i hope every american will turn out and vote. >> they did. the rush hour in silver spring was crawling with early voters thursday evening, undeterred by storm cleanup or broken legs. >> voting is our right. i would not miss it for anything. >> reporter: voters said they waited more than an hour to vote. why take the time to d

the air, and does the rest of the process, chewing up those nutrients in the water and producing nitrogenre doing that in a system where we're creating 12 to 16 tides per day. >> the wastewater for our building begins its journey by travel tog our primary tank which is a fairly normal looking manhole. beneath these manholes is a 10,000 gallon primary tank. there are two chambers. the trash chamber which filters out the trash and plastics and the organic solids settle out just as normal wastewater treatment process is. the water then flows to an equalization tank, a recirculation tank, and then on to tidal flow wetlands cell 1a. all those these cells look to be only 3 or 4 feet deep, they're actually 8 feet deep below this concrete sidewalk. the water repeatedly cycle into the cell from the bottom up. as the water comes up into this cell, it meets the microbes here to treat the wastewater. they flourish off the organics found in the wastewater. after multiple cycles, most of the wastewater treatment has already occurred and the water then flows to the vertical cells located around the corn

craig: liquid nitrogen. geoff, could you translate? >> question finally understand what you're saying. it's wonderful. [laughter] craig: alton brown, geoff peterson. good night, everybody. good night. [cheers and applause] [ female announcer ] pillsbury crescents fabulous but...when i add chicken, barbecue sauce... and cheese...and roll it up woo-wee! i've made a barbecue chicken crescent chow down. pillsbury crescents. let the making begin. here's a better idea. pillsbury grands! flaky layers biscuits in just 15 minutes the light delicate layers add a layer of warmth to your next dinner. pillsbury grands biscuits >>> you're watching cbs 5 eyewitness news in high definition. >>> just recently i started keeping track, because it was happening so often. >> i lost count. >> safeway shoppers, overcharged again. and again. and again. how the store is supposed to make it up to you. >>> and good evening. i'm ken bastida. >> i'm dana king. viewers tipped us off to what they say is on ongoing problem at safeway. one shopper says he has lost cou