Scientific American Frontiers : Life's Little Questions II

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Once again, Alan Alda discovers that the trivial often yields the profound (or at least the unexpected). Questions examined in this episode include why can't people tickle themselves?, why can't scientists cure the common cold?, and why are peppers hot?
Tickling Yourself (6:46)
A Real Tickling Machine (4:16)
Laughing Matters (7:32)
Cold Comfort (8:53)
Attacking Cold Viruses (4:19)
Why Are Peppers Hot? (4:41)
Taste Test (5:07)
Effects of Capsaicin (2:40)
Grains of Inspiration (8:48)
Credits: Alan Alda in Scientific Frontiers: Life's Little Questions II (0:45)

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