gauss, by the way, also proposed using mathematics to communicate with extraterrestrials.eemingly unpredictable occurrences of the primes actually had a beautiful and succinct description. so a modern-day mathematician who can help us figure out what gauss was getting at is our own terry tao. so terry is a professor of mathematics at ucla, a recent recipient of the fields medal, which is mathematics' highest honor, and also a recipient of a macarthur genius award. so, and in fact, gauss, who was called the "prince of mathematics," well, terry's not a prince, but he has been called the "mozart of math." so, terry, thanks for coming and helping us learn about prime numbers. >> thanks, though it's funny i'm called mozart, because i'm terrible at the piano. >> so, terry, i know that the primes are a deep and abiding interest of yours, and i think they are for a lot of people because on the one hand they seem like they just occur arbitrarily as we go along the number lines. so in the beginning they're sort of closely spaced, and then as we start whizzing down to the end of the

. >> it's about time somebody gauss vitaly back.retty. >> not like serious pete is a big youtube prankster. a competitive eater and not expecting the prank, i don't think. >> three, two, one -- go! [ laughter ] >> what is that? . >> nutella. [ laughter ] >> now that is awful, but imagine -- he had a whole freakin' mouth full of ghost pepper. >> he went big. i love how he's going -- >> oh. look at him. over there like a little kid dying laughing at this poor vitaly. >> he could be actually dying. [ laughter ] >> wow! no doubt -- >> his face is turning inside out. >> it's not going away. >> i never felt so bad for vitaly. i feel horrible for him right now. >> you know what? he kind of brought this on himself. just a little bit sorry. >>> i want to eat [ bleep ] -- >> dude's going to show off his athletic skills with an extreme jump. >> you see there is a child's car there. >> the only thing extreme about this video, is the fail. ananytythihingng.. ananywywheherere.. ananytytimime.e. ananyoyonene.. spsprereadad t thehe d delelicicioiou

citing unnamed diplomatic sources reported the man atop the pyramid gauss clipped in a u.s. air strike, similar to the one of the 18 bombings over iraq. u.s. asserting, no evidence to back up these claims and isis is as dangerous as ever even on united states soil. right to cnn pentagon correspondent barbara starr. pentagon officials and sources in the intelligence community outright dismissing these reports, baghdadi was injured in a coalition strike. what makes them so confident he's fine? >> reporter: you know it can always change but right now it is based on the intelligence that they do have and it is what they believe is happening right now on the ground. u.s. intelligence believes isis leader abubakar al baghdadi for now remains firmly in charge no intelligence indicating he's been injured in a recent coalition air strike, despite press reports. the u.s. has already identified these men as potential successors to the isis leadership putting millions of dollars of reward on each of their heads. there's no shortage of supporters on the ground or online. >> we're very de