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Human Body Facts

Brain & Mind Facts


Nerve signals can travel about 120 meters per second
Your brain has about 86 billion neurons
The brain’s glymphatic system clears waste mainly during sleep
A typical visual reaction takes about a fifth of a second
The hippocampus helps you build mental maps of places
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
Blind people’s visual cortex can help process touch and sound
Yawning may help regulate brain temperature
Specialized circuits help you recognize faces fast
Phantom sensations show the brain keeps a map of the body
Your brain runs almost entirely on glucose at rest
You cannot tickle yourself — your brain predicts the touch
Your brain is only about 2% of your body weight
A good night’s sleep can improve next-day problem solving
Music recruits hearing, memory, and emotion circuits together
Your inner ear helps the brain keep you balanced upright
Decision-making blends gut feeling with deliberative circuits
Pain is generated by the brain, not just by injured tissue
Mindfulness practice can measurably change brain structure
Your brain never truly turns off during sleep
Chronic stress can shrink memory-related brain volume
Practice rewires the brain through lifelong plasticity
Multitasking is mostly rapid switching, not true dual focus

Brain & Mind