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Anthropology

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Easter Island statues

ISLAND WEAR  A new analysis concludes that colossal stones placed on top of some Rapa Nui, or Easter Island, statues were rolled up earthen ramps by small groups of people using only long ropes.

Geologist Alia Lesnek

DEICED PASSAGE  Rocks on an Alaskan island display smooth surfaces covered by cracks created when ice once moved over them. Alia Lesnek (shown) and colleagues have determined that ice on this and three nearby islands retreated about 17,000 years ago, just before ancient humans colonized the Americas.

bonobos

SOCIAL DELIVERY  Researchers have observed three cases of captive female bonobos serving as helpers for pregnant females about to give birth, a behavior typically viewed as exclusive to humans. Here, a group of wild bonobos includes a mother carrying her infant.

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