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Rethinking the peopling of the Americas, and the best ways to get groundwater back
What Alaska’s eroding coastline says about Earth’s future, and how Yellowstone ravens use their smarts to find wolf kills
An alleged nuclear blast may reignite weapons testing, and who owns the Moon
Tropical birds’ ‘silent spring,’ and mapping people’s brains during surgery
Matching sounds to shapes, and stories from the AAAS annual meeting