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illustration of asteroid heading for Earth

SPACE ROCK  An iron asteroid hurtles through space in this artist’s conception of an event that left a large crater in northwest Greenland sometime in the distant past.

mammoth, mastodon, and gomphothere

MAMMOTH WORLD  A Columbian mammoth (Mammuthus columbi), an American mastodon (Mammut americanum) and a gomphothere (Cuvieronius) were among the prehistoric elephant relatives that roamed North America and Eurasia until the end of the last ice age.

Chase Kulakowski

STILL RECOVERING  Chase Kulakowski, now aged 3, developed acute flaccid myelitis in October 2016. What started as a runny nose quickly progressed to a having lifeless right arm, the Chicago Tribune reported. But surgery and physical therapy has given Chase use of his arm again.

skulls and bone fragments from Lagoa Santa, Brazil

REVEAL  DNA analyses of these skulls and bone fragments from Lagoa Santa, Brazil, and other ancient remains from North and South America are helping scientists learn more about the peopling of the Americas.

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