Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Denmark has twice as many pigs as there are people.
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A scorpion can hold its breath for up to 6 days.
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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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A group of pugs is called a grumble.
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