These Cave Rocks Are Made out of Bacteria

Stalactites hold tight to the ceiling, the saying goes, and stalagmites might grow high enough to reach it. But the simple mnemonic doesn’t come close to covering the variety of weird, rocky shapes growing all over a cave. There are even, it turns out, rocks made from bacteria. They’re not putting the “tight” in “stalactite” so much as the “ack!”

Researchers found the microbe-made rocks in a cave in northern Sweden called Tjuv Antes. (It’s named for a fugitive thief who allegedly hid there

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