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Human Body Facts

Brain & Mind Facts


Deep-sleep brain waves slow to about 1–4 cycles per second
The prefrontal cortex keeps maturing into your mid-20s
The adult skull is made of 22 bones
The spinal cord handles some reflexes before the brain joins in
Mirror neurons fire when you watch someone else act
When idle, your brain’s default network stays busy
The cerebellum holds more neurons than the rest of the brain combined
Smell ties tightly to memory through deep brain pathways
The corpus callosum carries roughly 200 million nerve fibers
Your brain is about the size of two clenched fists
Babies are born with soft spots in the skull

Brain & Mind