In 1752, Benjamin Franklin tied a key to a kite and flew it in a storm to find out that lightning was a form of electricity.
1752年，本杰明·富兰克林将一把钥匙系在风筝上，在暴风雨中放飞，他发现了闪电是电的一种形式。
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Benjamin Franklin's studies on flying a kite in an electrical storm from 1752 show the first time anyone had proposed that lightning is electricity and not a supernatural force.