Pedro Alvarez didn’t have balloons. Unlike the rest of the kids on the street who were throwing water balloons, Pedro could only find his grandfather’s linen handkerchief to play with. He thought he could catch water in the piece of cloth and throw it like the other kids did with the rubber balloons. To his surprise, the water ran right through the handkerchief. Unbeknownst to him, at only five years old, Pedro had filtered the water that came out of the faucet. Nowadays, he does the same thing; only now, instead of linen, he uses nanotechnology.
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