Michael Le Page explains how this “multi-region brain organoid” contains 80 per cent of the cell types found in a 40-day-old fetal brain.

The team behind it aims to study conditions like autism and schizophrenia — with some suggesting they could one day be used in artificial intelligence. But this all throws up major ethical issues…

Hear the full story on New Scientist Weekly, a news podcast for the insatiably curious, hosted by Rowan Hooper and Penny Sarchet.

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