Researchers have used stem cells to grow pea-sized structures that resemble the developing human brain, an advance that offers a way to model brain maladies that are otherwise hard to study. The human brain is one of the most elaborate natural structures known to science. These new lab-grown "mini brains" are imperfect, and a long way off from matching the real thing. Still, the structures, which are about four millimeters in diameter, share some of the crucial three-dimensional architecture of a developing human brain. The different brain parts interact in a normal manner, though they aren't necessarily in the proper places.
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