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NOVA
Season 29 · Episode 4
Sex: Unknown
0.055mOctober 30, 2001
The film investigates the complicated world of gender identity.
Episodes
- Episode 1Search for a Safe Cigarette
- Episode 218 Ways to Make a Baby
- Episode 3Secrets of the Mind
- Episode 4Sex: Unknown
- Episode 5Russia's Nuclear Warriors
- Episode 6Bioterror
- Episode 7Life's Greatest Miracle
- Episode 8Methuselah Tree
- Episode 9Flying Casanovas
- Episode 10Death Star
- Episode 11Neanderthals on Trial
- Episode 12Fireworks
- Episode 13Secrets, Lies, and Atomic Spies
- Episode 14The Missing Link
- Episode 15Shackleton's Voyage of Endurance
- Episode 16Why the Towers Fell
- Episode 17Fire Wars