Your brain needs to clean itself. Not because its cluttered with inane thoughts or clogged by your filthy sense of humor, but because—like every other organ—it creates waste products. Now, scientists have worked out how it keeps itself clean.The rest of your body has this thing called the lymphatic system: a series of tubes and vessels that filter out garbage and ship it out of the body. But your brains a small, sealed unit when it comes to waste. “If you look at a body-wide map of the lymphatic system, you see a great big void in the brain,” explained neuroscientist Jeffrey Iliff to Wired.

via How Your Brain Cleans Itself.