A young man by the name of Sirish Subash questioned whether washing fruits and vegetables actually did any good removing pesticides. And to answer that question, he engineered a solution!
What he created was a hand-held AI system that can detect residual pesticides, based on light reflected, which is invisible to the naked eye. (And by the way, washing does NOT remove all pesticides)
And for his effort, he was recognized as "America's Top Young Scientist" and given a $25,000 prize.
To be fair, the other nominees were no slouches either, and you can read about their entries in the link above.
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