Freeze, thaw, repeat: chilled tardigrades still reach a ripe old age

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Freeze, thaw, repeat: chilled tardigrades still reach a ripe old age
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The little animals known for their toughness have normal lifespans even when subjected to multiple cycles of freezing and thawing.

A tardigrade . Members of one species can live long even after being repeatedly frozen and thawed. Credit: Steve Gschmeissner/SPL

Tardigrades — also sometimes called water bears or moss piglets — are a group of microscopic, moisture-loving animals that look somehow both adorable and alien. They are known for their ability to survive drought and freezing temperatures by shutting down nearly all their biological functions, achieving a state more extreme than mere hibernation.

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