Now: She hit the books – hard – earning her Ph.D in neuroscience at UCLA in 2007. "My thesis has a long, pretentious-looking title," says Bialik, 33. While she still reviews grants, Bialik jumped back into acting with roles on Curb Your Enthusiasm and Fat Actress. In 2008, she gave birth to her second child with husband Michael Stone. "I'm working overtime being a mom," she says. "But I'd love to do a sitcom again."