Observing my son, I can recognize the intellectual curiosity inherent in children: What happens if I drop a spoon on the floor?

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Drop your book bags on the marble floor, and then practice saying "muy bonita" when you see the view of the Pacific Ocean from your secluded balcony.

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Every drop of saliva you leave on a Styrofoam coffee cup or hair follicle that falls to the floor contains DNA that in theory can be tested for everything from ancestry to disease risk.

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"As she dropped down on the floor, Stephanie -- 21 years old -- had the presence of mind to drop down on the ground with her, pull her out of the aisle, place her fingers over where Allie had been wounded, and applied pressure the entire time, while the gunman was still shooting, " the president said.

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He would sit next to me as I chopped, eyes fixed firmly on the floor, waiting for my knife work to prove clumsy enough for a carrot or tomato to drop.

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