Here is a concise summary of the 17 fascinating facts about the human body mentioned in the text:
**Summary (17 Facts, Grouped by Category)**
* **Brain & Nervous System**
1. Brain generates 15-25 watts of electricity, enough to power a small LED bulb.
2. Myth debunked: Humans use most of their brain, not just 10%.
* **Teeth & Hair**
3. Human teeth are almost as strong as shark teeth.
4. Tooth enamel is the hardest part of the human body.
5. Human hair is practically indestructible, catches fire easily, and can support 100g of weight.
* **Facial Expressions & Body Functions**
6. There are four main facial expressions (anger, fear, surprise, happy/sad).
7. Genuine facial expressions tend to be symmetrical.
* **Development & Regeneration**
8. Babies have 60 more bones than adults (born with up to 270 bones, which fuse over time).
9. The human skeleton regenerates completely every 10 years.
10. The liver can regenerate itself even if up to 75% is removed.
* **Senses & Organs**
11. The human eye has a resolution of around 500 megapixels (72 times more accurate than an iPhone 6 camera).
12. Skin is the largest organ, weighing around 8 kg (16% of body weight), with over 600 sweat glands per square inch.
13. Kidneys filter blood 25 times a day, processing 180 liters (only 1% becomes urine).
14. The "third eyelid" (pink corner of the eye) is a remnant of a bird's membrane, protecting the eye.
* **Curious Connections**
15. Heartbeat can synchronize with the rhythm of music.
16. Enzymes that digest food start digesting the body after death.
17. Some atoms in our bodies are made of cosmic dust from exploded stars, billions of years old.
* **Bonus Stat**
+ The heart pumps approximately 200 million liters of blood in an average lifespan.
Here are the key facts extracted from the text, numbered and in short sentences:
1. **Brain Electricity**: A human brain generates 15-25 watts of electricity, enough to power a low-wattage LED bulb.
2. **Brain Usage**: People use most of their brain, even when sleeping, contrary to the myth that only 10% is used.
3. **Human Teeth Strength**: Human teeth are almost as strong as shark teeth.
4. **Tooth Enamel**: The enamel covering teeth is the hardest part of the human body.
5. **Gastric Juice**: Hydrochloric acid in the stomach can destroy metals and burn skin if exposed.
6. **Stomach Color Change**: The inside of the stomach turns red when a person blushes.
7. **Hair Durability**: Human hair is practically indestructible despite catching fire easily.
8. **Hair Information Storage**: A strand of hair can reveal information about a person's circulatory system, including vitamins, drugs, or alcohol.
9. **Facial Expressions**: There are four main facial expressions (anger, fear, surprise, happy, and sad), with over 7,000 variations.
10. **Symmetrical Expressions**: Genuine facial expressions are more likely to be symmetrical.
11. **Babies' Bones**: Babies are born with up to 270 bones, 60 more than adults, which fuse together over time.
12. **Human Eye Resolution**: The human eye has a resolution of approximately 500 megapixels, 72 times more accurate than an iPhone 6 rear camera.
13. **Color Vision**: The human eye can distinguish between 10 million colors.
14. **Skin Weight**: An adult's skin weighs approximately 8 kilos (16% of total body weight), making it the largest organ.
15. **Sweat Glands**: Every square inch of skin has over 600 sweat glands.
16. **Skeleton Regeneration**: The human skeleton regenerates completely every ten years on a cellular level.
17. **Eye Closure**: Eyes are closed for about 10% of waking time, with an average of 15 blinks per minute.
18. **Blinking Gender Difference**: Women blink twice as much as men, with those on birth control pills blinking up to 32% more.
19. **Baby Blink Rate**: Babies blink fewer than 2 times per minute.
20. **Kidney Function**: Kidneys filter blood about 25 times a day, processing 180 liters, with only 1% becoming urine.
21. **Kidney Size**: An adult kidney is roughly the size of a fist.
22. **Third Eyelid**: Humans have a small, vestigial third eyelid in the inner corner of the eye.
23. **Liver Regeneration**: The liver can regenerate itself to its original size even if up to 75% is removed.
24. **Heartbeat Synchronization**: The heartbeat can synchronize with the rhythm of music, especially if it has a continuous increase in volume or tempo.
25. **Post-Mortem Enzyme Action**: Digestive enzymes begin to break down the human body after death.
26. **Cosmic Dust in Bodies**: Some atoms in human bodies are made of cosmic dust billions of years old, also found in plants, animals, food, and objects.
27. **Heart's Lifespan Work**: The heart pumps approximately 200 million liters of blood in a lifetime, enough to fill 1.5 million barrels.