Scientists are trading in lab mice for hundreds of mini-brains on a chip
Two years ago, Diane Hoffman-Kim grew her first brain ball. She started by dropping a few mouse nerve cells into a special nonstick petri dish, and with nothing but each other to hold on to, the cells grew into a sphere less than a millimeter wide: a mini-brain. The biological engineer has since reared thousands more of these organoids, with neurons that spark with lively electrical activity. Except ... they still aren't quite alive.
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