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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
Your brain has almost no oxygen reserve
You have roughly 100 trillion synaptic connections
Dopamine helps the brain mark what feels rewarding
The funny bone is a nerve, not a bone
Reading reuses brain areas built for vision and speech
Curiosity lights up the brain’s reward and memory systems
Emotions light up widespread networks, not one “feeling center”
Blind people’s visual cortex can help process touch and sound
The blood-brain barrier filters what reaches your neurons
Brain folds nearly triple the cortex surface area
Working memory holds about 7 items at once
A typical visual reaction takes about a fifth of a second
Your brain’s myelin insulation speeds signals like cable coating
Language lives across a connected left-hemisphere network
Your brain predicts the world before you fully see it
Phantom sensations show the brain keeps a map of the body
The prefrontal cortex keeps maturing into your mid-20s

Brain & Mind