i'm lesley stahl. the information technology revolution changes our world on a daily basis, but one thing that doesn't change is our fascination with the so-called nerds who not only transformed society but became billionaires in the process. this edition features a trio of these tech titans: bill gates, the man who created the world's most valuable software company, microsoft; mark zuckerberg, the young, geeky computer programmer behind the internet phenomenon facebook; and sergey brin, the cofounder of google. we'll begin with brin. has there ever been a brand name like google? in less than five years, it went from an idea to a global verb, as in, "i googled this," or, "i google that," or, "i google you." back in 2006, shortly after the company went public, google opened its doors for the first time and let us google them. >> we have north america. >> oh, look at that. google cofounder sergey brin is showing us an electronic globe that displays the mountains of google searches happening around the wo

and as lesley stahl first reported in 2009, when coal ash is dumped into wet ponds--and there are more than 500 of those across the country-- the result can have an enormous health risk on the people living in nearby communities. >> we get about 48%, nearly half of the electricity in this country from coal. >> jim roewer is one of the top lobbyists for the power industry. >> coal is going to be around for a long time. >> and we really can't get rid of coal. >> we shouldn't get rid of coal. >> well, should or shouldn't, we can't, and coal makes waste. would you say that the industry has done a good job of disposing of the coal ash waste? >> we can do better. >> does that mean no? >> well, we had a kingston spill. >> that's kingston, tennessee, where, in december 2008, a giant retention pool of coal ash buckled under the weight of five decades of waste. >> all the power lines have been knocked out. >> a billion gallons of muck shot into the emory river like a black tsunami... >> one person in the house, and he's alive. >> engulfing homes, uprooting trees... >> everything's gone. >> and t

lesley stahl first talked with mark zuckerberg in 2008, and three years later, we sat down with mark again. he gave us a preview of his site's new profile page, a change that would affect the 500 million people who were then using facebook, an idea that zuckerberg had cooked up in his dorm room at harvard. >> when you first thought about this--19 years old--is this what you had in mind? did you see this far into the future, or is it way beyond what you dreamed? >> well, it's funny. i mean, when i was getting started, you know, with my roommates in college, you never think that you could build this company or anything like that, right? because, i mean--it just--and we were college students, right? >> yeah. >> i mean, we were just building stuff because we thought it was cool. i do remember having these specific conversations with my friends where we thought, "you know, someone is gonna build this. someone is gonna build something that makes it so that people can stay connected with their friends and their family," but no way would we be the ones who were contributing to kind of leadin

in 2008, lesley stahl went to meet one of the most powerful men in the world, ali al-naimi, the saudiil minister and de facto head of o.p.e.c., the oil cartel. >> if most americans had an opportunity to sit down with the oil minister of saudi arabia, the thing they would like to know is where you think the price of oil's gonna be, say, in about six months. is it gonna be up or down? >> you want my classic answer? >> no, i want your honest-- >> okay. >> appraisal and judgment. >> my honest judgment is, if i were to know what the price of oil six months from now, i would be in las vegas, okay? >> [laughing] he may be smiling, but this is a man with serious heartburn and vertigo. in 2008, the price of oil had been soaring and sinking uncontrollably. why did the price, in your opinion, spike in july? why did it go way up to $147 a barrel? >> basically, there was a-- what's called a fear premium. >> and the fear was that saudi arabia itself had peaked out, that you'd reached your ceiling of how much available oil is left in your overall reserve. so what's the truth? >> the truth is, here i

. >> i'm lesley stahl. >> i'm morley safer. >> i'm lara logan. >> i'm byron pitts. >> i'm scott pelley. those stories tonight on "60 minutes." that was me... the day i learned i had to start insulin for my type 2 diabetes. me... thinking my only option was the vial and syringe dad used. and me... discovering once-daily levemir® flexpen. flexpen® is prefilled. doesn't need refrigeration for up to 42 days. no drawing from a vial. dial the exact dose. inject by pushing a button. flexpen® is insulin delivery... my way. levemir® (insulin detemir [rdna origin] injection) is a long-acting insulin used to control high blood sugar in adults and children with diabetes and is not recommended to treat diabetic ketoacidosis. do not use levemir® if you are allergic to any of its ingredients. the most common side effect is low blood sugar, which may cause symptoms such as sweating, shakiness, confusion, and headache. severe low blood sugar can be serious and life threatening. ask your healthcare provider about alcohol use, operating machinery, or driving. other possible side effects include injection

this sunday on "60 minutes" lesley stahl visits a baby lab. >> reporter: we watched as our team askedstions 20 years that might have gotten her laughed. does wesley at the ripe old age of five months know the difference between right and wrong? wesley watches as the puppet in the center struggles to open up a box with a do i inside. the puppy in the yellow shirt comes over and lends a hand. then the scene repeats itself but this time the puppy in the blue shirt comes and slams the box shut. nice behavior? mean behavior? at least to our eyes. but is that how a 5-month-old sees it? does he have a preference? >> do you remember these guys from the show. >> reporter: to find out a researcher who doesn't know which puppet was nice or mean offers wesley a choice. who do you like. he can't answer but he can reach. >> that one. >> reporter: wesley chose the good guy. he wasn't alone. more than three quarters of the babies tested reached for the nice puppet. >> that one. >> reporter: they tried it out on younger babies, 3-month-olds who can't control their arms enough to reach but they can vot