7 Fascinating Facts About the Human Body: That Science Just Discovered

Proteck'd EMF ApparelHealth & EMF Specialists

Published July 20, 2026·10 min read

Your body generates electromagnetic fields, emits visible light too faint to see, and runs on bioelectric signals across 86 billion neurons. You're not just living in an electromagnetic world. You are one.

Does Your Body Actually Generate Electricity?

Yes. And not just a little. Every living cell in your body maintains something called a membrane potential, which is basically a tiny voltage difference between the inside and outside of the cell. According to research published by the National Institutes of Health, this potential sits at roughly negative 70 millivolts in a typical neuron ^[1]. That sounds small. But multiply it across trillions of cells and the numbers add up fast.

Your nervous system runs entirely on electrical impulses. When you touch a hot stove, an electrical signal races from your fingertip to your brain at speeds up to 268 miles per hour. Your heart beats because of an internal electrical pacemaker called the sinoatrial node. Even your muscles contract because of tiny electrical commands from your brain.

Here's what makes this relevant to your daily life: because your body is an electrical system, it interacts with external electromagnetic fields, too. The devices you carry, the Wi-Fi routers in your home, even the wiring in your walls all produce EMF radiation that your body's bioelectric systems encounter constantly. If you want to understand how electromagnetic waves actually work, The Fascinating Science of Electromagnetic Waves: What Nobody Taught You in School breaks it down beautifully.

This is why some people are becoming more intentional about the electromagnetic radiation in their environment. Companies like Proteck'd EMF Protection design clothing with shielding technology built right into the fabric. It's a pretty clever approach to something most people don't even realize is happening around them 24/7.

How Strong Are Human Bones Compared to Steel and Concrete?

You've probably heard the claim that bone is stronger than steel. Is it actually true? Sort of. According to the Cleveland Clinic, human bone is about four times stronger than concrete on a weight-for-weight basis ^[2]. Ounce for ounce, compact bone can withstand compression forces that would crumble many building materials. But it's not quite as straightforward as saying it beats steel, because steel handles tension forces differently.

The femur, your thighbone, is the largest and strongest bone in the human body. It can support roughly 30 times your body weight before fracturing. That's why car accidents and serious falls are usually what it takes to break one. For context, a 150-pound person's femur can handle around 4,500 pounds of force. Engineers at the University of Michigan have actually studied femur geometry to improve the design of load-bearing structures. Your skeleton is literally inspiring architecture.

What most people don't know is that your skeleton is constantly rebuilding itself. Through a process called bone remodeling, your body replaces old bone tissue with new material on a continuous cycle. The NIH estimates that the entire adult skeleton is replaced roughly every 10 years ^[1]. You're literally not walking around on the same bones you had a decade ago. Think about that for a second.

And here's a fun detail: a quarter of all the bones in your body are in your feet. Each foot contains 26 bones, meaning your two feet account for 52 of your 206 total bones. That's a staggering amount of engineering packed into something most of us stuff into uncomfortable shoes every morning. The smallest bone? The stapes in your middle ear, about the size of a grain of rice, and it helps you hear by transmitting vibrations.

What Is the 'Second Brain' in Your Gut?

If someone told you that your gut has its own nervous system with more neurons than your spinal cord, you'd probably think they were making it up. But the enteric nervous system, sometimes called the "second brain," contains approximately 500 million neurons lining your gastrointestinal tract. Research from Harvard Medical School has shown that this network can operate independently of the brain and spinal cord ^[3].

This isn't just a fun piece of trivia. Your gut's neural network directly influences your mood, your immune response, and even your decision-making. About 95% of the body's serotonin, the neurotransmitter associated with happiness and well-being, is actually produced in the gut. Not the brain. That "gut feeling" you get before making a big decision? There's real neuroscience behind it.

Dr. Michael Gershon at Columbia University literally wrote the book on this, called "The Second Brain," and his research has reshaped how gastroenterologists think about conditions like IBS and anxiety. The vagus nerve serves as the main communication highway between your gut and your brain, carrying signals in both directions. When your stomach churns before a job interview, that's a two-way electrical conversation happening in real time.

What's really interesting from a body electricity standpoint is that these gut neurons fire using the same electrochemical processes as brain neurons. Your digestive system is running its own bioelectric network. For more surprising biology facts that overlap with the technology around us, check out 15 Fascinating Tech Facts You Didn't Know: With Sources.

Can Your Heart's Electrical Field Really Be Detected Feet Away?

This one sounds impossible. But your heart generates the strongest electromagnetic field of any organ in the body. According to research from the HeartMath Institute, the heart's electrical field can be measured up to 3 feet away from the body using magnetometers. The heart's magnetic field is roughly 100 times stronger than the brain's.

Every heartbeat starts with an electrical impulse from the sinoatrial node, which acts as the heart's natural pacemaker. This impulse spreads through the heart muscle in a precise sequence, causing the coordinated contraction that pumps blood. An electrocardiogram (ECG) works by detecting these electrical signals through sensors placed on the skin. The fact that we can read these signals externally tells you just how powerful they are.

Here's where things get interesting for anyone wondering what does human body fascinating facts mean in the context of modern life. Your body is both a generator and a receiver of electromagnetic fields. That means the EM radiation from phones, laptops, routers, and other devices isn't just floating past you. Your body's own electrical systems are encountering it constantly.

This is one reason people are paying more attention to EMF shielding in everyday life. The Faraday Collection from Proteck'd uses silver-lined fabric to create a barrier between your body and ambient electromagnetic radiation. If you want to Learn About EMF Protection and how it actually works at a physics level, that's a good starting point.

Why Does Your Body Glow in the Dark (and You Can't See It)?

I'm not making this up. In 2009, a team of Japanese scientists led by Masaki Kobayashi at the Tohoku Institute of Technology used ultra-sensitive cameras to prove that the human body emits visible light. Not infrared heat. Actual photons of visible light. The catch? The intensity is about 1,000 times weaker than what the human eye can detect ^[4].

This biophoton emission is thought to be a byproduct of metabolic chemical reactions, specifically involving free radicals and the oxidation process in cells. The glow fluctuates throughout the day. Lowest emission happens in the morning. Highest in late afternoon. It roughly matches your metabolic rhythm.

The research, published in the journal PLOS ONE, found that the face, particularly the cheeks and forehead, glows the brightest. Why? Likely because of higher metabolic activity and melanin concentration in facial skin. It's a reminder that your body is constantly doing things you can't perceive, from emitting light to generating electromagnetic fields to conducting bioelectric signals across billions of neural pathways.

When you start stacking up these amazing human body facts, a pattern emerges: we are fundamentally electrical and electromagnetic beings. That realization changes how you might think about the invisible radiation surrounding you from everyday technology. For a deeper look at that topic, 15 Fascinating Facts About Electromagnetic Radiation: That Will Change How You See the World is well worth your time.

How Much Data Does Your Brain Process Every Second?

Your brain processes an estimated 11 million bits of information every second from your senses. But here's the kicker: you're only consciously aware of about 50 bits per second. The rest gets handled by your subconscious, running in the background like an operating system you never see.

According to research at the University of Pennsylvania, the human brain contains roughly 86 billion neurons, each forming thousands of connections called synapses. That gives you somewhere in the neighborhood of 100 trillion synaptic connections. A number so large it makes even the most advanced supercomputers look primitive by comparison. IBM's Watson, for reference, uses about 16 terabytes of RAM. Your brain's estimated storage capacity? Around 2.5 petabytes, or about 2,500 terabytes.

All of this processing runs on bioelectrical signals. Neurons communicate through action potentials, which are brief electrical charges that travel along nerve fibers. These signals operate at frequencies and voltages that are remarkably precise. A single misfiring neuron can cause a muscle twitch. A cascade of misfiring neurons is what happens during a seizure.

The wild part is that we're only scratching the surface of understanding how neural bioelectricity works. Every year, new studies from institutions like MIT and Stanford reveal more about how the brain's electrical architecture shapes everything from memory to personality. If you're into the intersection of biology and technology, 12 Surprising Tech Facts You Didn't Know: The Complete List connects some of these dots.

Is Every Person's Body Chemistry Truly Unique?

Fingerprints get all the attention, but your uniqueness goes way deeper than that. Every person has a distinct body odor profile determined by genetics, diet, and the roughly 1,000 species of bacteria living on your skin. A 2015 study from the University of Zurich found that humans can distinguish between at least 1 trillion different scent combinations, and your own scent is as individual as your DNA.

Your body also has a unique electromagnetic signature. The pattern of electrical activity in your heart is so distinct that researchers at the University of Buffalo have developed biometric identification systems based on ECG readings. Just like a fingerprint, no two people's heart rhythms are exactly alike. The university's system can identify individuals with over 98% accuracy based on cardiac electrical patterns alone.

Even your tongue has a unique print. And the pattern of blood vessels in your retina. And the way your voice box vibrates. When you ask what does human body fascinating facts mean, part of the answer is this: each body is a one-of-a-kind biological machine with its own electrical fingerprint, chemical signature, and physical architecture.

Understanding how unique and electrically active your body is puts things in perspective when you consider environmental factors like electromagnetic fields. Your body isn't a passive object sitting there. It's an active electrical system constantly interacting with its surroundings. That's precisely why products in the Faraday Collection exist, to give your body's unique systems one less external variable to contend with. For even more on the weird overlap between tech and biology, 12 Fascinating Tech Facts That Sound Too Weird to Be True is a great read.

About the Author

Proteck'd EMF Apparel

Health & EMF Specialists

The Proteck'd team covers EMF protection, silver-fiber apparel, and practical ways to reduce everyday radiation exposure. Every piece Proteck'd ships is designed, tested, and worn by the people who build it.