An average adult brain tips the scale near 1.3–1.4 kg (about three pounds). Male averages run a bit higher and female a bit lower, mostly tracking overall body size — not a simple IQ ruler.
Inside that mass sit gray matter, white matter, blood, and cerebrospinal fluid. Soft enough to sag without a skull, it still out-computes any laptop you own on sparse power.
Weight is not wisdom. Structure, connectivity, and experience shape ability more than raw grams on a pathology scale.
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