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Beneath the surface, the human body harbors astounding secrets that challenge believability. From organs with superhuman strength to shared DNA across species, we are truly remarkable beings. Though they defy logic, these bewildering biological truths illustrate the wonder of life itself. Join us as we journey through the mind-blowing oddities that make us undeniably human. You may never look at yourself the same way again!
Human Blood Has a Scent
Believe it or not, humans can smell blood. The metallic scent is caused by the iron in hemoglobin.
Your Immune System Would Stretch Over 60 Miles if Laid End to End
If all the vessels, nodes and organs involved in immunity were connected, they would span about 100,000 kilometers in an adult.
Sneezes Travel at High Speeds
When you sneeze, the air – along with saliva and mucus – is forced out of your mouth and nose in a high-speed burst. In fact, a sneeze can exceed speeds of 100 miles per hour!
Your Ears and Nose Never Stop Growing
While many parts of the human body stop growing after puberty, the cartilage in your ears and nose continues to grow throughout your life. This is why some elderly people have larger ears and noses than when they were younger.
Your Stomach Gets a New Lining Every Few Days
The stomach’s harsh acidic environment isn’t easy on its lining. To prevent the lining from being digested along with food, your stomach constantly renews itself – about every 3-4 days.
Humans and Giraffes Have the Same Number of Neck Vertebrae
Despite their long necks, giraffes have only seven neck vertebrae, the same number as humans.
You Produce Enough Saliva to Fill Two Bathtubs a Year
On average, a human produces between 0.5 to 1.5 liters of saliva each day. That’s up to 547 liters a year!
Your Bones Are Constantly Being Replaced
The human skeleton is dynamic and is being broken down and rebuilt constantly. This process is so robust that in about a decade, you’ll have completely new bones.
The Human Body Glows in the Dark
Yes, you read that right. Humans emit a faint glow, but it’s 1,000 times weaker than our human eyes can detect.
Babies Have More Bones Than Adults
When babies are born, they have 270 bones. As they grow, some of these bones fuse together, resulting in 206 bones in adults.
Your Small Intestine is Four Times Longer Than You Are
If stretched out, an adult’s small intestine can be about 20 feet long.
The Human Eye Can Differentiate Millions of Colors
It’s estimated that the human eye can distinguish up to 10 million different colors.
Your Heart Beats Over 100,000 Times a Day
On average, the heart beats about 70 to 100 times a minute. That’s up to 144,000 beats per day!
Fingernails Grow Faster Than Toenails
If you’ve ever noticed that you trim your fingernails more often than your toenails, it’s because fingernails grow about 3.5 times faster.
Humans Share 50% of Their DNA with Bananas
It sounds bizarre, but it’s true. This doesn’t mean we’re half banana, but rather that life on Earth shares common genetic building blocks.
Your Nose Can Remember 50,000 Different Scents
The human nose is more powerful than you might think, with the ability to recall a vast array of smells.
The Human Liver Has Over 500 Functions
From detoxification to producing important proteins, the liver is a multitasking powerhouse.
You Shed Millions of Skin Cells Each Day
Every day, you lose millions of dead skin cells, amounting to about 1.5 pounds a year.
Your Taste Buds Have a Short Lifespan
Taste buds only last about 10 to 14 days, after which new ones take their place.
The Length of All Your Blood Vessels Could Circle the Earth
If laid end to end, the blood vessels in the human body would measure around 60,000 miles.
Humans and Slugs Share a Lot of DNA
Surprisingly, humans share about 70% of their DNA with slugs.
Your Hair Grows Faster Than You Think
On average, human hair grows about half an inch (1.25 cm) per month, or about 6 inches per year.
The Strongest Muscle in Your Body is the Jaw Muscle
Based on weight, the masseter, or jaw muscle, is the champ in terms of sheer strength.