As Madeline Lancaster lifts a clear plastic dish into the light, roughly a dozen clumps of tissue the size of small baroque pearls bob in a peach­colored liquid. These are cerebral organoids, which possess certain features of a human brain in the first trimester of development—including lobes of cortex (Russ Juskalian, MIT Technology Review). Continue reading Meet the Organoids: Growing Human Brains in a Petri Dish