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The sandbox tree is a terrifying species covered in sharp spikes that make it unsettling to look at. Its trunk is filled with cone-shaped thorns so tough that even monkeys can’t climb it, which is why it’s also called the “monkey-no-climb tree.” But the spikes are only the beginning. Its fruit is poisonous and, as it matures, dries out on its own. Because the inner and outer layers shrink at different speeds, enormous tension builds inside, like a tightly wound spring. When fully ripe, a slight