The fairyfly, the world's smallest insect, is 0.139 mm long — smaller than a single-celled paramecium.
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The Sumerians developed one of the earliest writing systems.
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A rhinoceros has thick skin for protection.
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Fossils form when organisms are preserved in sediment over millions of years.
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The invention of dialysis allows patients with kidney failure to survive.
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Saber-toothed cats had elongated canine teeth.
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The steam engine powered early industrial machinery.
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The Earth's axis is tilted about 23.5 degrees.
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A narwhal’s tusk is actually an elongated tooth.
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