Do you have a question for a scientist featured in the latest episode of Frontiers? Here's your chance to stand in Alan Alda's shoes. Click on a scientist's name below to read a brief bio and to e-mail your question. A selection of answers will be posted online.

George L. Blackburn		Shows Alan how to lose weight permanently in "Doctor Empathy"
Roy L. Walford		Demonstrates the diet he'll use to live to 110 in "Eat Less -- Live Longer"
Danny Lopez		Advocates a return to traditional Native American foods in "The Desert's Perfect Foods."

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