You know how your mouth tingles when you eat pineapple? Did you figure it was from the acidity? if so you figured wrong, it's actually thousands of raphides stabbing your tongue. Raphides are crystals of calcium oxalate that poke holes in cell membranes causing irritation. The tiny needles that are released when the plant is damaged are a defense mechanism to prevent the plant from predators. Just curious how this makes the vegetarian crowd feel, after all pineapples don't have a face and aren't exactly cuddly.
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