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Human Body Facts

Brain & Mind

06 Facts

Heart & Blood

06 Facts

Bones & Muscles

05 Facts

Senses

08 Facts

Sleep

02 Facts

Longevity

09 Facts

Digestion

08 Facts

Skin

05 Facts

Immune System

00 Facts

Lungs & Breathing

00 Facts

Hormones

00 Facts

Eyes & Vision

00 Facts

DNA & Cells

00 Facts

Teeth & Mouth

00 Facts


Why Laughter Is Serious Biology
Why Time Feels Faster as You Age
The Quiet Science of Sleep and Why Dreams Matter
How Your Brain Builds Reality From Incomplete Senses
Your lungs contain nearly 1,500 miles of airways
Your liver can regenerate even after major tissue loss
Your feet have about a quarter of all the bones in your body
Your body makes about 25 million new cells every second
You have more bacterial cells than human cells
Humans spend about one-third of life asleep
Stomach acid is strong enough to dissolve metal
You shed roughly 30,000 to 40,000 skin cells every minute
Your nose can detect about one trillion different smells
Bone is stronger than steel by weight
Your heart beats over 100,000 times every day
You have about 60,000 miles of blood vessels
Your brain uses about 20% of your body’s energy
Babies have more taste buds than adults
Fingernails grow about 3–4 millimeters a month
Your brain is about 75% water
Taste buds renew themselves roughly every 1–2 weeks
Humans blink about 15–20 times every minute
Saliva contains enzymes that start digesting food before you swallow
Goosebumps are leftover from when humans had thicker fur
Blood makes a full body circuit in under a minute

Human Body