In Brief.

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    • Abstract:
      The article presents brief reports on scientific advances. Researchers have found Sumatran orangutans who walk on two legs in trees, indicating that human ancestors could have starting walking upright while still in the trees. Seismic array tests have suggested that water in hydrated minerals combines with mantle rock and is subducted below the earth's crust. Research suggests that infants between four and eight months can identify when a multilingual person switches between languages.