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Saniwa ensidens

ANCIENT LIZARD  Four-eyed Saniwa ensidens, which lived 50 million years ago, closely resembled the modern monitor lizard Varanus mertensi, shown here with an overlay of the skull of S. ensidens.

Mississippi River flooding

HIGH WATER  Floods along the Mississippi River in spring 2011 rivaled the Great Flood of 1927 in size. Human engineering of the river may be making such floods bigger.

Køge Bugt

RAPID RETREAT  New seafloor data reveal that Køge Bugt (shown) and other fast-retreating glaciers in southeastern Greenland sit within deep fjords, allowing warm Atlantic Ocean water to speed up melting.

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