Modern counts put the human brain near 86 billion neurons — not the old “100 billion” round number. That vast cell army still fits inside a skull you can hold in two hands.
Neurons talk through synapses, tiny junctions that pass chemical and electrical messages. Billions of cells times thousands of connections each create a network denser than any city map.
Scale is the surprise. A single organ runs language, memory, and mood with a population larger than every human who ever lived — all on about twenty watts.
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