A great white shark recently decapitated a Mexican fisher as he was diving for shellfish. But what was the reason for the unusually gruesome attack?
A long, looping filament of plasma snapped over the sun's north pole, creating a 'polar vortex' that scientists can't explain.
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Laser scans have revealed that what was thought to be an Iron Age hillfort in northwestern Spain is, in fact, an early medieval stronghold built in the fifth century A.D. and occupied for the next 200 years.