i'm del walters in new york. at the top of the hour. >> the notion that the west is at war with islam is an ugly lie. >> president obama hosts a security summit aimed at stopping what he calls violent extremism. ♪ >>> from al jazeera's headquarters in doha we also have ahead. [ gunfire ] >>> the u.n. recognized government in libya asks the security council to lift the arms embargo against the country. >>> germany rejects greece's request

del walters has more. >> he would be stargazing at night.ometimes he would identify the stars and show them to me. i couldn't see anything. i said that's very nice, but i couldn't figure them out. >> she is the mother of astro physicist neil tyson. with his criticcally acclaimed tv sores "cosmo." >> tyson wears many hats, tv, and radio show host. >> i'm tyson. i'm astro physicist. >> he's so synonymous with popular science that it even earned him a spot on the big bang theory. >> i liked pluto. erog i do not like. >> you i didn't demote pluto. that was a vote of the astronomical union. >> tyson knew he wanted to be a physicist since he was a child. helping neil and and their children with their dreams they had unique challenges. especially neil who set his sights on a career that few blacks were pursuing. >> why don't you go to a rowcationnal school. >> that was often the crisis that schools would give poor black students. tysons feared that would sidetrack their son's ambitions. >> i had to live to things that were not said. i had to listen

. >> i'm del walters in new york. we are breaking away right now because we want to take you to washington d.c. a senate subcommittee is set to hold a hearing on the new policies between the united states and cuba. these are live images out of the senate chambers where that hearing is about to take place. that is florida senator marco rubio presiding over the hearing. the senator opposing president obama's every move to normalize relations between the u.s. and cuba. listen in for a second. he is introducing members of the panel now. we're going to give you some background. cuba's human rights violations are expected to be a major concern today. they may become a major hurdle in the road to any agreement between the count two countries. we have a report. >> today's hearings come as we're getting a first look at new photos of former cuban leader fidel castro. in several pictures, the 88-year-old seen speaking with a university student and hold ago recent newspaper. more than 20 photos from the cuban newspaper were relea