Scientific American Frontiers on PBS

This installment explores how people push themselves to the limits of endurance and performance. In one segment, host Alan Alda visits a French deep-diving team as they train. In another, he follows a New Jersey “memory consultant” as he trains high-school students for the contest called Memoriad. Also: reactions to mountain sickness in the Alps; and a profile of Dr. Jerry M. Linenger, a NASA astronaut who was weightless for five months while he was aboard the Russian space station Mir.