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NASA's Curiosity rover has found definitive proof that water once ran across the surface of Mars. NASA scientists say that new photos from the rover show rocks that were smoothed and rounded by water.
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A huge, magnitude-8.7 earthquake in April produced stronger ground shaking than any earthquake ever recorded, and surprised seismologists by triggering more than a dozen moderate earthquakes around the world. One seismologist thinks we're witnessing the gradual evolution of a new boundary between tectonic plates.
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Some dilemmas produce vivid images in our head — and we're wired to respond emotionally to pictures. That can trigger unconscious biases that influence our judgment of right and wrong.
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In the midst of the Cold War, many worried about securing a source of safe, drinkable water after a nuclear explosion. The results of a 1957 U.S. government study show that a post-bomb bottle of beer could be a fairly safe, but not tasty, substitute.
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A Harvard researcher says a "new gospel" written on a fragment of papyrus shows some early Christians believed he had a wife.
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Some experts are concerned that access to genomic information could stoke fears and invade privacy.
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Some of the biggest human migrations coincided with major changes in climate, according to a new analysis. Researchers say early humans set out in search of climates where more food was available. And some populations stayed put in certain locations because barriers like glaciers blocked their progress.
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A scientist discovered the first lesula specimen being kept as a pet in the Democratic Republic of Congo in 2007.
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It sounds like a straightforward question: When did we become human? But as commentator and anthropologist Barbara J. King suggests, the answers are multiple and entangled. An African archaeological site dated to 100,000 years ago holds some clues.
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A Slinky falling in slow motion doesn't move the way you'd expect; the top of the Slinky falls normally, while the bottom seems to float in midair. The physics of that weird Slinky movement can also represent how we use signals to interact with the world around us.