TIL African elephants can exchange information by emitting low-frequency sounds that travel dozens of miles under the ground on the savanna. The sound waves come from the animals' huge vocal cords, and distant elephants “hear” the signals with their highly sensitive feet.
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Tim Lamont, a young scientist who recorded the amazing sounds of healthy coral reefs, found that if he played them back on reefs that were being manually restored after damage, the fish came back more quickly, and in more species. (Links in comments)
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