Ada Lovelace Day, Hopscotch, Lucius and Serial's Sarah Koenig

It's Ada Lovelace Day! In celebration of the mother of computer programming, we get to know a great lady nerd of today: Hopscotch app co-founder Jocelyn Leavitt. Then we go behind-the-scenes at Serial, the new podcast from This American Life. Lauren Chooljian talks to singers from indie pop powerhouse Lucius about their nerdy passions. Mr. Superlative stops by. And a Gilmore Girls-related nerd confession.