NOVA
PBS' premier science series helps viewers of all ages explore the science behind the headlines. Along the way, NOVA demystifies science and technology, and highlights the people involved in scientific pursuits.

Season 29 · Episode 4 ·
Sex: Unknown
The film investigates the complicated world of gender identity.
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Episode 4 of season 29 of NOVA: “Sex: Unknown”. Aired 2001-10-30. Watch it online free on ZapFlix.