Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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The largest breed of rabbit is the Flemish Giant.
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Sloths take two weeks to digest their food.
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Jumping fleas can accelerate 50 times faster than the space shuttle.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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