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Watch Scientific American Frontiers Season 7 Episode 4 online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Scientific American Frontiers: Spider Canyon: A 30-year study of funnel web spiders in Arizona reveals an interesting theory about hybridization. Frozen Alive: Natural antifreeze in deep sea fish may help prolong donated organs. Ultimate Speed: Scientists study the biomechanics of the two fastest land animals, the cheetah and the pronghorn antelope. Hidden Depths: Explorations in the middle depths of the ocean off Monterey, California, turn up spectacular new life forms. High Anxiety: Can a new test identify who might succumb to mountain sickness?