Super Soaker
The Super Soaker is no life-changing invention we know. (Previously known as the “Power Drencher,”) Was debuted in 1989 by no other than NASA engineer Lonnie Johnson, and by 1991 he may have already retired because his simple idea of a good water soaker sold him 2 million of them in the US alone!
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Water guns are still probably the only acceptable gun-themed toy in the American mainstream today.