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Scientists grow test tube human brains with potential to think and feel

A group of Cambridge scientists are attempting to grow human brains outside of the body in a lab. But they don’t look anything like what you might imagine. The “cerebral organoids” are made with stem cells derived from human skin and raised in giant incubators. Without any kind of blood supply, they receive nutrients by soaking in a special fluid. And these brains are tiny, small enough to fit in a petri dish – about four millimeters across and crammed with about two million neurons.
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