World of Engineering
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The most fun way to learn something new everyday.
加入 August 2015
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Your eyes are more powerful than you might think. The Earth’s curvature is what keeps a person from seeing for kilometres in the distance. But if the Earth were flat, you’d be able to detect the flame of a candle from 48 kilometres (30 miles) away. That’s like being able to see the flame of a candle from twice the length of the island of Manhattan!
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