US scientists have partially revived pig brains four hours after the animals were slaughtered.
The findings could fuel debate about the barrier between life and death, and provide a new way of researching diseases like Alzheimer's.
The study showed the death of brain cells could be halted and that some connections in the brain were restored.
How was it done?
Thirty-two pig brains were collected from an abattoir.
Four hours later the organs were connected to a system made by the team at Yale University.
It rhythmically pumped (to mimic the pulse) a specially designed liquid round the brain, which contained a synthetic blood to carry oxygen and drugs to slow or reverse the death of brain cells.
The pig brains were given the restorative cocktail for six hours.
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