You have more bacteria in your body than cells. There are about 10 times more bacteria cells in your body than human cells.

Your stomach acid is strong enough to dissolve metal. However, your stomach lining is protected from the acid by a layer of mucus.

Your bones are constantly being remodeled. Your bones are constantly being broken down and rebuilt. This process is called bone remodeling.

You have about 60,000 miles of blood vessels in your body. That’s enough to wrap around the Earth twice.

Your heart beats about 100,000 times a day. That’s about 36 million times a year.

You breathe about 22,000 times a day. That’s about 7 million times a year.

You blink about 20 times a minute. That’s about 14,400-19,200 times a day.

You produce about 2 pints of saliva a day. That’s enough to fill a water bottle.

You lose about 77 pounds of skin in your lifetime. That’s about the weight of a young child.

You grow about 10 inches taller between the ages of 12 and 18.

Your brain uses about 20% of your body’s energy. That’s even more than your heart.

Your eyes can see about 1 million different colors.

You have about 10,000 taste buds on your tongue and they are replaced every two weeks or so.

You have about 5 million olfactory receptors in your nose. These receptors are responsible for your sense of smell.

You have about 650 muscles in your body, but only about 30 of them are used for facial expressions.

Your body temperature is about 98.6 degrees Fahrenheit, but it can vary by as much as 1 degree depending on your activity level.

Your heart stays hard at work pumping about 1.5 gallons of blood every minute.

Your lungs can hold about 6 liters of air, but you only use about 1 liter at a time when you breathe normally.

Your brain weighs about 3 pounds, but it uses about 20% of your body’s energy.

Your skin is the largest organ in your body, and it covers about 2 square meters.

Your stomach can hold about 1 liter of food, but it can stretch to hold up to 4 liters.

Your intestines are about 20 feet long, but they can stretch to be about 25 feet long.

Your kidneys filter about 200 liters of blood per day, but they only produce about 1.5 liters of urine.

Your liver weighs about 3 pounds, and it can regenerate itself if more than 90% of it is removed.

They grow about 3.5 millimeters per month, compared to toenails, which grow about 1.6 millimeters per month. This is generally because fingernails endure more mechanical stress and exposure, promoting growth.

It receives oxygen directly through the air. The lack of vasculature allows the cornea to remain clear and unclouded, offering a precise window through which light can enter the eye.

This equates to about 1.5 pounds a year, contributing significantly to household dust. Regular skin shedding allows for the replacement of old cells with new, healthier ones, maintaining skin integrity and function.

This amount of power can sustain a low-wattage LED light. This electrical power is generated through the biological activity of neurons and other cells in the brain.

It is highly mineralized and primarily composed of hydroxyapatite, a crystalline structure made of calcium and phosphate. This hard substance protects your teeth from decay and physical damage.

This happens because, as we grow, some bones fuse together. The process is part of natural development, accommodating changes in the body as it matures.

This iron is distributed in the hemoglobin of the blood and various other organ tissues throughout the body. It is a vital element, helping to transport oxygen in the bloodstream.

This is about four times the amount that concrete can bear, showcasing the remarkable strength and engineering of the human skeletal system, designed to protect vital organs and support our physical activity.

This fact emphasizes the importance of regular cleaning and maintenance of living spaces to minimize dust inhalation and its potential health impacts.

This difference in size allows for the heart to fit better in the chest cavity. Despite this size difference, both lungs are still vital for respiration and oxygen-carbon dioxide exchange.

This is a testament to the complex nature of the olfactory system, which allows humans to detect and differentiate a wide variety of odors, helping in various tasks such as food tasting and danger detection.

They can filter an average of 1.3 liters of blood per minute, removing toxins and waste materials, highlighting the kidneys’ critical role in maintaining the body’s homeostatic balance.

Through metabolic processes generating heat, our bodies showcase the remarkable energy production and dissipation capabilities necessary for maintaining a stable internal environment.

Despite their long necks, giraffes have only seven neck vertebrae, the same as humans, illustrating the fascinating ways evolutionary paths can diverge while maintaining fundamental similarities.

This mind-boggling number indicates the complex and intricate makeup of the human body at a microscopic level, a testament to the marvels of biological engineering.

This is enough to fill two swimming pools, underscoring saliva’s crucial role in initiating digestion and helping to maintain oral hygiene.

This circadian rhythm in microbial composition is influenced by various factors including diet and sleep patterns, affecting digestion and potentially the person’s health.

This reflects a symbiotic relationship where bacteria help in various functions such as digestion, while the body provides a hospitable environment for the bacteria, highlighting the interconnectedness of life forms.

This large variety makes it challenging to create a one-size-fits-all solution for common colds and explains why people can catch colds repeatedly throughout their lives.

Although the light emitted is 1,000 times weaker than what our eyes can perceive, it’s a fascinating insight into the biochemical reactions happening in our bodies that can emit photons, showcasing the lesser-known luminescent properties of biological organisms.

This surprising genetic overlap illustrates the fundamental biological building blocks shared across various life forms on Earth, showcasing the interconnectedness of life through evolutionary history.

This happens when fetal skin cells die and peel off, creating unique ridge patterns, a characteristic that later becomes critical for identity verification and forensic analysis.

Despite being compactly folded in the abdominal cavity, it plays a critical role in nutrient absorption, leveraging its considerable length to maximize surface area for digestion.

This vast microbial community plays both beneficial and potentially harmful roles, aiding in the breakdown of food while also potentially contributing to oral diseases.

This demonstrates the body’s powerful mechanism to expel irritants from the nose or throat, potentially helping to prevent infection by clearing out viruses or bacteria.