📖 *Popular Body Facts* 📖

*Q:* How much of the brain is water?  

*A:* 80%

*Q:* How many skin cells do humans shed every hour?  

*A:* About 600,000 particles

*Q:* How many fragrances can the nose remember?  

*A:* Up to 50,000 fragrances

*Q:* How many bacteria are on the face?  

*A:* About 32 million

*Q:* How many bones do babies have at birth?  

*A:* About 350 bones

*Q:* How many days does it take for stomach lining to renew?  

*A:* 3–4 days

*Q:* How long can the body survive without food?  

*A:* Several weeks

*Q:* How many days without sleep can be fatal?  

*A:* About 11 days

*Q:* How much of the hand strength is from the little finger?  

*A:* About 50%

*Q:* What fraction of total length is the head at birth?  

*A:* One-quarter

*Q:* What fraction of total length is the head in adulthood?  

*A:* One-eighth

*Q:* How many muscles are in the face?  

*A:* About 60 muscles

*Q:* How many muscles are needed to smile?  

*A:* 20 muscles

*Q:* How many muscles are needed to frown?  

*A:* Over 40 muscles

*Q:* How many blood cells are in one drop of blood?  

*A:* About 250 million cells

*Q:* How thick is blood compared to water?  

*A:* 6 times thicker

*Q:* What is the longest cell in the human body?  

*A:* Motor neuron

*Q:* What is the largest cell in humans?  

*A:* Female egg

*Q:* What is the smallest cell in humans?  

*A:* Male sperm cell

*Q:* How many times does a person breathe per day?  

*A:* About 20,000 times

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