we have helium, neon, argon, krypton, and xenon. now, we're missing radon because it's radioactive. we're all familiar with helium. it's used in balloons and blimps. the rest are used to fill various light bulbs and lamps. but what are some of the properties that they have in common? they're odorless, and they're colorless, and they're all quite unreactive. as you go down in the family, each one gets heavier than the previous one. let me show you what i mean. this is helium. there it goes. this is neon. it's somewhat lighter than air. there it goes. now, argon and krypton are both heavier than air. and xenon is the heaviest of the ones we've seen. it's the proverbial lead balloon. you can begin to see the different types of information derived from the periodic table. but how do chemists use the table in their work? glassmaking is one example. at one time in the ancient world, glass was so rare that it was prized more highly than jewels or gold. as we mastered the techniques of glassworking, glass became a commonplace necessity. the types of glass multiplied tremendously so that tod

the agency was very argon and self ashored. he posted boasted he's in daily contact with presidents and heads of services. >> the relationship with mossad is very fragile. minister of intelligence from 2004 to 2008 the cable show he respected an audit of south africa's intelligence sharing sharing with israel. >> i didn't want anything to do with mossad whatsoever. i'm not prepared any way to go into actual internal operational activities. >> the spy cable's also confirm israel's historical collaboration with apartheid south africa to develop new england weapons. ironically today israel is working to stop it's rival iran from doing the same thing. it frequently warns south africa about tehran's nuclear ambitions. in december 2010 there is description of shipment of yellow cake to iran. it accuses an armenian broker. >> he passes through turkey where he would be preparing the yellow goods. we assess this is yellowcake. from the same country where iran previously obtained 500 tons, which we assess is south africa. >> they urge so

it happened this morning along argon drive in north baltimore. crews are working to repair the break and restore water service to that area. new this noon a prince george's county man is charged with soliciting sex from a 12-year-old on line. police say the girl notified authorities after receiving sexually explicit messages and photos from 21-year-old vincent hill in a messenger app. detectives then posed as the girl. they say hill told the girl to cut school and meet him at a shopping center for sex acts. when he showed up police arrested him. the parents accused of leaving their two toddlers in the car while they went wine tasting appeared in court today. police say it was only 28 degrees at the time and there was no heat left on. mike conneen has the details on today's appearance. >> 45-year-old jennie chang and 41-year-old christopher lucas appeared together for a status hearing this morning. the northwest d.c. couple has been charged with second degree cruelty to children. police say on january 31st in the afternoon in the foggy bottom neig

they recently came up with the a way to determine each by using the gas argon. the relationship between those can be measured and understood in a way a way that we will give you a sense of how long ago that surface was clear well beyond my understanding but suffice it to say that it is -- these folks based on what they know on earth and what they understand that mars has the same processes are very similar they are making judgments that i believe we will stand the test of time. >> i think we'd better bring it to an end. i'm sorry. [applause] [inaudible conversations] [inaudible conversations] >> every weekend book tv offers programming focused on nonfiction authors and books. keep watching for more. watch any of our past programs online. but now that the current best-selling nonfiction books. topping the list end-of-life care in being mortal. >> welcome. i would like to welcome you all hear for what is a momentous and landmark event for the evening. honoring the large new book. a couple of ignores mountains of brief introductions and him and start the program. i

they recently came up with the a way to determine each by using the gas argon. the relationship between those can be measured and understood in a way a way that we will give you a sense of how long ago that surface was clear well beyond my understanding