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Sea urchins can be very painful and sometimes even dangerous to step on, but are completely harmless if held gently. Minerals reinforcing their five teeth are arranged in a way so that the teeth chip only on one side, effectively sharpening themselves.

Sea urchins can be very painful and sometimes even dangerous to step on, but are completely harmless if held gently. Minerals reinforcing their five teeth are arranged in a way so that the teeth chip only on one side, effectively sharpening themselves.

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