Actor Alan Alda, a board member for the World Science Festival, recently hosted a live Q&A session on Twitter, with help from Goodman Media, which is handling media outreach for the Festival, held June 10-14. On June 2, Alda discussed String Theory and other scientific topics with followers of the World Science Festival's Twitter account (@worldscifest). The festival is also on Facebook and MySpace. In the photo after the jump, Alda works with Goodman Media's Heath Fradkoff.