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Spider Canyon
A 30-year study in Arizona shows that aggressive spiders thrive in the harsh desert environment, while cautious ones do best in the cool canyons.


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Frozen Alive
Marine biologists find a natural antifreeze that helps deep sea fish survive the winter, and may help donated organs last longer.


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Ultimate Speed
Scientists study the biomechanics of the cheetah, the world's fastest land animal, as well as that of its prey.


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Hidden Depths
A remote sub dives to the unexplored middle depths of the ocean off Monterey, California, revealing a spectacular variety of new life forms.


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High Anxiety
Physiologists attempt to identify who will adapt to high altitudes and who might succumb to mountain sickness.


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