As an impressionable sophomore at East China Normal University in Shanghai, Joe Tsien knew he was interested in biology, but he wasn't sure how he wanted to focus his studies. "I felt I did well in biochemistry class," says Tsien, so he took up residence in a biochemistry lab. There, he says, "I only saw beakers and a half-broken centrifuge" that jumped around the benchtop as the rotor spun. "That really turned me off."













