“When Pranav Sivakumar was six years old, he found an encyclopedia about famous scientists lying around the house. And he has been fascinated with outer space ever since. For years, every Saturday morning, his parents drove him an hour to an astrophysics lab for “Ask-A-Scientist” class. And before long, he teamed up with researchers he met there to study the gravitational lensing of quasars. Give him a big round of applause,” Obama told the audience.