margot lee shetterly recalls a group of african-american women who played key roles in the devising of air rah naughtics -- arrow aeronautics. and astronomy professor chris empy talks about his book, "beyond." booktv in prime time tonight starting at eight eastern. >> the los angeles times has been putting on the festival of books for more than 20 years, and it has become an institution that's part of the community. and if, and it's a way that we can celebrate with the readers of the paper and with the city as a whole the very notion of reading. and today when the idea of there being something called fake news is out there, i think that books help us celebrate the way that words and facts are grounded in storytelling and in history. >> watch our live coverage of the los angeles times festival of books all weekend, april 22nd and 23rd, on booktv on c-span2. >> in case you missed it on c-span, oklahoma congressman steve russell on the 100th anniversary of the u.s. entry into world war i. >> on the 6th of april, 100 years ago today, where i am standing with concrete evidence of german hos