Catapult the cow! 6 medieval castles that were never conquered
Many medieval castles were formidable stone fortifications. Live Science takes a look at six that were never conquered.
Easter Island statues may have 'walked' thanks to 'pendulum dynamics' and with as few as 15 people, study finds
Simple physics may explain how the Easter Island statues could "walk" miles with only a handful of people, but the debate over their transport is far from over.
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