Three months later, the finished product is about four millimetres across and contains around two million neurons.
Then all you have to do is sit back and wait. The jelly mimics the tissue a brain would normally be surrounded with in an embryo – like a makeshift skull – and encourages them to develop relatively normally. “It’s the opposite of normal jelly – it starts off as a liquid which you pour on and it jellifies as it warms up in the incubator,” she says.
Finally, the developing brains are enveloped in a blanket of jelly.
