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How ants build bridges using very simple rules

Check out these army ants building an ant bridge across a gap that suddenly widens: Army ants have tiny brains and no one’s in charge. So how do they organize themselves into building bridges? They rely on their strength in numbers and simple rules. To see how this unfolds, take the perspective of an ant on the march. When it comes to a gap in its path, it slows down. The rest of the colony, still barreling along at 12 centimeters per second, comes trampling over its back.
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