Meet Your Brain · Brain
Bone, three membranes, and a bath of fluid it floats in.
Tissue that soft needs serious protection. Your brain sits inside a bone helmet, wrapped in three membranes, floating in a clear fluid that makes it effectively weigh about fifty grams instead of fourteen hundred.
That floating matters. Without the cushion of cerebrospinal fluid, the brain's own weight would crush the tissue at its base. The fluid also carries waste away — and research suggests that clearance runs faster during sleep, which is one thread in why sleep matters so much.
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