that was petrov today then. >> the most for sure. okay, jon, let's talk about the sideline meetings that are equally as important quite frankly, as what happens in front of those microphones. on the sidelines today president obama met with raul castro. very cordial, smiling as may off are, but there is still a big differences between these two countries. what do we know? >> here is the deal with raul castro. he is 84 years old. he is a relic in many ways. he is the president of cuba, but of course he goes back all the way with his brother fidel, and others to the actual cuban revolution of 1959, and that promised the trade embargo. which you know is only 90 miles away from florida. so yesterday he comes address it is general assembly, history is made. today he meets with president obama and the two get on okay, no reason for them to not. but in his speech yesterday, raul castro did lay out very clearly the issues that still stand between them. and among them for him is guantanamo bay, he wants that back. also, the return of other asp

[phone beeps] ilya petrov.knock at door] hey, steve, come on. >> steve: hey, john. >> john: what's going on man? >> steve: i need your help. it's about bo. >> gabi: whooo. you're such a cute girl. yes, you are. you're the sweetest,

open, fourth seeded wozniak in a battle with petrov sabkoska. >>> roger federer playing some of his best tennis as of late. it took him just an hour and 20 minutes to dispatch of steve darcis of germany. match point, 46th winner of the night. tomorrow night serena williams continues her quest for the serena slam all in the same year. >> we'll be right back. it took serena williams years to master the two handed backhand. but only one shot to master the chase mobile app. technology designed for you. so you can easily master the way you bank. what do a nascar driver... a comedian... and a professional golfer have in common? we talked to our doctors about treatment with xarelto . xarelto is proven to treat and help reduce the risk of dvt and pe blood clots. xarelto has also been proven to reduce the risk of stroke in people with afib, not caused by a heart valve problem. for people with afib currently well managed on warfarin, there is limited information on how xarelto and warfarin compare in reducing the risk of stroke. i tried warfarin before, but the blood testing routine and dietary re

. >> i was wondering how would you compare tolkachev to earlier agents people like vladimir petrov? >> i mention these other regions in the beginning of the book and the question was how do they compare? there were lots that were certainly very helpful but maybe not in the top level. i was put tolkachev in the very highest level of the top two or three spies. here is 2015 i'm telling you the story which ended in 1985 so it's been a long time. tolkachev is a spy that almost nobody ever heard of but he was hugely important. i wrote this book based on the original documents that i got from the cia. i first asked and then i implored and then i cajoled and i did a lot of lobbying and waited several years and eventually i got the cia to give me some of the operational cables between the moscow station and headquarters so i could better understand what really happened and i interviewed some of those case officers who were on the street who shook tolkachev's hand and the station chiefs. this book i think it's unusual that way. if you read much nonfiction or even fiction about espionage this

petrov was carried out by the march of dimes, by volunteers. not a lot of high-powered, well-trained research assistance. it was carried out by school principals, housewives. housewives were involved in that enormous trial and collecting all of the data and the data sheet. it really was the public was so engaged in that through the march of dimes. >> it was a universal, national effort focused on one disease. >> on one disease. >> we're going to get to the count in a minute because the whole discussion of the trial and what happened is an amazing story. two other names though. isabel spent isabel morgan is a minor character in the book but not in the world of science and she was part of the johns hopkins team that was working on polio. one of the first things that have to be done by this group that harry got together with to figure out how the different types of polio are there. are the one like smallpox? arthur 100 that change over time like influence which makes it difficult to make a vaccine. they were working and trying to figure out what t