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Season 4, episode 9. This player now records resume state for the active profile so browse, account, and detail pages can bring you back here quickly.
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Roller Coasters
Since the turn of the 20th century, designers have competed to build them faster, taller, and steeper. But as technology pushes the envelope with flips, weightlessness, and more g-force than a jet, how many thrills can the human body take?
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Episode 10: Observatories: Stonehenge to Space Telescopes