Must-see video: Human brain grown in lab

Scientists at Ohio State University say they've grown a nearly complete human brain in a lab.

They say it's the size of a pencil eraser and has 99 percent of the genes in a fully developed fetal brain.

Researchers hope it will help them find a cure for diseases like Alzheimer's and autism, as well as understanding PTSD and brain injuries.

The brain was engineered from adult human skin cells and grown in a dish for 15 weeks.

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