🧠 BRAIN: COMMAND CENTRE
PAGE 1 OF 5 · THE THREE-POUND UNIVERSE
NETWORK
EIGHTY-SIX BILLION NEIGHBOURS
The average adult human brain has on the order of 86 billion neurons — and each can connect to thousands of others, making possible paths beyond counting. The whole thing weighs about 1.3 to 1.4 kg, mostly water, fat, and protein. "Command centre" is fair: it reads senses, steers movement, plans ahead, and invents new ideas — all with chemistry and tiny electrical spikes.
⚡ DENDRITES + AXON
Neurons pass signals: branches (dendrites) collect input; a long wire (axon) can carry output toward the next cell.
FIRE!
SIGNAL
⚡ Neurons are cells built to chatter with electricity and chemistry.
JELLY
🧬 Soft, folded, and wrapped in protection — your skull, fluid, and meninges.