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Human Body Facts

Longevity Facts


Your heart beats over 100,000 times every day
Humans spend about one-third of life asleep
Your liver can regenerate even after major tissue loss
Your body makes about 25 million new cells every second
You are born with about 300 bones — and end up with 206
You have more bacterial cells than human cells
Your ears never stop growing
Fingernails grow about 3–4 millimeters a month
Your body replaces most of its cells over time
The soft center of a spinal disc is mostly water
Before birth, most blood bypasses the lungs
New neurons can form in the adult hippocampus
Young bone bends more than it snaps
A healing bone first builds a callus
Bone adds material where you load it
Much of your skeleton is rebuilt about every 10 years
Red blood cells live about 120 days
The brain’s glymphatic system clears waste mainly during sleep
Your brain runs almost entirely on glucose at rest
Your brain is only about 2% of your body weight
Adult bone marrow is red in some bones and yellow in others
Endurance athletes often rest near 40 beats a minute
An adult body holds roughly 5 liters of blood
Your brain can generate new connections after injury
Mindfulness practice can measurably change brain structure

Longevity