Eli5 why balloons pop in grass
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Grass has a bunch of sharp needles on it called tricromes. These needles are meant to stop pests, and some species have bigger needles to stop bigger animals. Corn is a type of grass. Try running your hand along some corn and you come away with a bunch of tiny cuts.
The grass we grow on our lawns has much tinier needles that cant cut us, but they’re still there. Maybe a single needle is unlikely to poke through the balloon, but each blade of grass has thousands of needles, and only a single one needs to be successful to pop it.
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