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monarch butterfly on tropical milkweed

MONARCH BEWARE  As the climate changes, lovely tropical milkweed popular in gardens may become even more of a danger to monarch butterflies than it is now.

map of world’s rivers and streams

ROVING RIVERS  An updated map of the world’s rivers and streams reveals their global fingerprint. Colors denote a river’s width, from deep blue (30 meters) to yellow (thousands of meters).

illustration of bison and mammoths

WHERE’D THEY GO? About 13,000 years ago, during the Pleistocene Epoch, bison, mammoths (illustrated) and other large mammals roamed North America. Researchers continue to argue over what caused their extinction.

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