Teeth are not bone — they are made of dentin and enamel, which are harder but more brittle than bone.
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Giraffes have high blood pressure to pump blood to their brains.
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Fossilized bones reveal information about prehistoric diets.
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In 1953, Watson and Crick described the double-helix structure of DNA.
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The first successful human heart transplant was performed in 1967.
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The invention of dialysis allows patients with kidney failure to survive.
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Certain reptiles regulate body temperature through basking.
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The Megalodon lived millions of years before humans appeared.
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