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Life & Evolution

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wild elephants

SLEEP DIARIES  The first study of electronically monitored sleep in two wild elephants (one shown above) finds a record-breaking low average for mammals.

hematite

SIGNS OF LIFE  In rocks left over from ancient hydrothermal vents, these microscopic tubes of hematite, an ore of iron, may be remnants of early microbes.

fishing boat full of anchoveta

Historically, the Peruvian anchoveta was a main source of protein for people in Peru. Today, though, most of the catch is turned into fishmeal that feeds animals.

Life & Evolution

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