Only in Harvard Square: Stump the Grad Students

Corie Lok reports on the filming of a Nova pilot in which passersby were invited to pose tough science questions to a trio of grad students sitting outside Grendel's Den:

... For about four hours, the graduate students—two from MIT and one affiliated with both MIT and Harvard—fielded dozens of questions, from the straightforward ("How do you measure a decibel?") to the practical ("How can we tell if there’s lead in the crystal glasses we drink from?") and the esoteric ("Which is faster: the speed of light or the speed of thought?"). ...