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Human Body Facts

Brain & Mind Facts


Humans spend about one-third of life asleep
Split attention between two conversations is surprisingly poor
Your brain generates enough electricity to power a small LED
Your brain uses about 20% of your body’s energy
Your brain is about 75% water
During REM sleep, your body is temporarily paralyzed
Your eyes can distinguish millions of colors
Shivering is muscles making heat
The funny bone is a nerve, not a bone
You have roughly 100 trillion synaptic connections
Working memory holds about 7 items at once
Curiosity lights up the brain’s reward and memory systems
Emotions light up widespread networks, not one “feeling center”
Learning physically strengthens synaptic connections
Dopamine helps the brain mark what feels rewarding
The blood-brain barrier filters what reaches your neurons
Your brain has almost no oxygen reserve
New neurons can form in the adult hippocampus
Brain folds nearly triple the cortex surface area
The adult human brain weighs about 1.4 kilograms
Nerve signals can travel about 120 meters per second
Your brain has about 86 billion neurons
A tiny node in the heart sets every beat
Reading reuses brain areas built for vision and speech
The brain’s glymphatic system clears waste mainly during sleep

Brain & Mind