World of Engineering
@engineers_feed
The most fun way to learn something new everyday.
参加 August 2015
68 フォロー中 3.5M ファン
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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