鬼ごっこ: wheelie

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Sulphur-crested cockatoos learn to open wheelie bins in Sydney – video

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Sulphur-crested cockatoos are learning to pry open bins, with researchers finding the new skill has caught on in 44 Sydney suburbs in just two years. With help from the public, Australian and German ecologists have do...

Mystery of the wheelie suitcase: how gender stereotypes held back the history of invention

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に 1972 an American luggage executive unscrewed four castors from a wardrobe and fixed them to a suitcase. Then he put a strap on his contraption and trotted it gleefully around his house. This was how Bernard Sadow i...