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White tiger mystery solved

White tigers today are only seen in zoos, but they belong in nature, say researchers reporting new evidence about what makes those tigers white. Their spectacular white coats are produced by a single change in a known pigment ...

dateMay 23, 2013 in Plants & Animals
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How some leaves got fat: It's the veins

A "garden variety" leaf is a broad, flat structure, but if the garden happens to be somewhere arid, it probably includes succulent plants with plump leaves full of precious water. Fat leaves did not emerge in the plant world ...

dateApr 11, 2013 in Plants & Animals
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