One of the revived rotifers. (Michael Plewka) For tens of thousands of years, a microscopic creature lay frozen and immobile underground in the Siberian permafrost. Yet, when scientists thawed it out, the tiny multicellular animal didn't just revive - it reproduced, suggesting that there is a mechanism whereby multicellular animals can avoid cell damage during the freezing process and wake up ready to rumble. "Our report is the hardest proof as of today that multicellular animals could withstand tens of thousands of years in cryptobiosis, the state of almost completely arrested metabolism," said biologist Stas Malavin of the Soil Cryology...