The first study from GreenDrill—an ambitious project to recover rock samples buried thousands of feet beneath the Greenland Ice Sheet—finds that Greenland’s Prudhoe Dome ice cap had fully melted around 7,000 years ago, much more recently than previously thought.

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In a ferromagnet, combined forces are at work. In order for a compass needle to point north or a fridge magnet to stick to the fridge door, countless electron spins inside them, each of which only creates a tiny magnetic field, all need to line up in the same direction.

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