Why Don't Octopuses Tie Themselves in Knots?

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Scientists at the Hebrew University of Jerusalem have finally solved the age-old question of why an Octopus' independent arms don't stick to themselves. Unlike us, octopuses have no idea where any of their eight arms are at any time, because the arms move as if they almost have a mind of their own. It turns out that octopus skin produces a chemical that lets the arms know not to grab on for dear life.

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