Neurodegenerative diseases have been halted by harnessing the regenerative power of hibernation, scientists say.
Bears, hedgehogs and mice destroy brain connections as they enter hibernation, and repair them as they wake up.
A UK team discovered "cold-shock chemicals" that trigger the process. They used these to prevent brain cells dying in animals, and say that restoring lost memories may eventually be possible.
Experts have described the findings as "promising" and "exciting".
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