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What Are UFOs?

What Are UFOs?

Season 52 Episode 1
53:43
Extreme Airport Engineering

Extreme Airport Engineering

Season 52 Episode 2
53:40
Dino Birds

Dino Birds

Season 52 Episode 3
53:35
Egypt's Tombs of Amun

Egypt's Tombs of Amun

Season 52 Episode 4
53:40
Pompeii's Secret Underworld

Pompeii's Secret Underworld

Season 52 Episode 5
53:40
Baltimore Bridge Collapse

Baltimore Bridge Collapse

Season 52 Episode 6
53:32
Revolutionary War Weapons

Revolutionary War Weapons

Season 52 Episode 7
53:39
Secrets of the Forest

Secrets of the Forest

Season 52 Episode 8
53:41
Ultimate Crash Test: Countdown

Ultimate Crash Test: Countdown

Season 52 Episode 10
53:29
NOVA Season 52

Ultimate Crash Test: Impact

Season 52 Episode 11
53:27
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NOVA

First Face of America Preview

One unlucky day 13,000 years ago, a slight, malnourished teenager missed her footing and tumbled to the bottom of a 100-foot pit deep inside a cave in Mexico’s Yucatán. Rising seas flooded the cave and cut it off from the outside world—until a team of divers chanced upon her nearly complete skeleton in 2007.