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.

Please e-mail your questions before April 15, 2003

Neil Gershenfeld		Helps Alan printo out his personal prototype in "A Factory on Your Desk"
Sandy Pentland		Innovates technology you can take with you in "Never Forget a Face"
Tod Machover		Uses computers to collaborate with would-be musicians in "The Toy Symphony"
Alex Slocum		Judges MIT's competitive physics contest in "Teetering to Victory"