Light­ning still is­n’t fully un­der­stood, though it been stud­ied since the times of Ben­ja­min Frank­lin, who fa­mously tied a key to the end of a kite string and flew the kite in a thun­der­storm. When sparks leapt from the key, he cor­rectly con­clud­ed light­ning is an elec­tri­cal cur­rent.

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