This is one of the most widespread neurological myths! Research, especially with modern brain scanning techniques like fMRI, shows that almost all parts of the brain are active during a normal day, even during simple tasks. Even damage to a small part of the brain can have devastating consequences, which contradicts the idea that we have 90% unused capacity. Every part of the brain has an important function.
π¦ Kids β’ Human Body
The blood in your veins is blue.
π‘ Explanation
False! Blood is always red. When blood has lots of oxygen, it's bright red. When it has less oxygen, it's dark red. Your veins look blue because the light shining through your skin makes them appear blue to our eyes, not because your blood is actually blue.
π¦ Kids β’ Human Body
Your tongue is the strongest muscle in your body.
π‘ Explanation
That's a common misunderstanding, but it's false! Your tongue is incredibly flexible and enduring, but it's not the strongest muscle. Different muscles are strongest depending on how you measure. The jaw muscle (masseter) can exert the most force when you bite. Your thigh and butt muscles are stronger when it comes to lifting heavy things or jumping.
π¦ Kids β’ Human Body
Your eyes see things upside down.
π‘ Explanation
It's true! When light enters your eyes, the lens flips the image upside down onto your retina. But don't worry! Your brain is super clever at quickly turning the image right-side up again, so you see the world just as it should be.
π¦ Kids β’ Human Body
You have more bones when you are born.
π‘ Explanation
That's true! When you are born, you have about 300 bones in your body. Many of them are small and soft. As you grow up, some of these bones fuse together to form bigger, stronger bones. That's why an adult human only has 206 bones.
π¦ Kids β’ Human Body
Your heart beats over 100,000 times a day.
π‘ Explanation
Your heart works all the time, even when you're sleeping! It pumps blood all through your body to give your muscles and brain oxygen. Beating so many times every day shows just how amazing your heart is.
π¦ Kids β’ Human Body
You are taller in the morning than in the evening.
π‘ Explanation
That's true! During the day, gravity squishes the little cushions between your backbones. But when you sleep, your back stretches out again, making you a tiny bit taller in the morning than when you go to bed!
π¦ Kids β’ Human Body
Your brain can feel pain just like the rest of your body.
π‘ Explanation
False! It might sound strange, but your brain actually can't feel pain. The brain tissue itself doesn't have any pain receptors. Instead, the brain is what receives and understands pain signals from *other* parts of your body. So, if you bump your knee, your brain tells you it hurts, but the brain itself can't feel pain!
π§ Adults β’ Human Body
Stomach acid can dissolve razor blades.
π‘ Explanation
The human stomach produces hydrochloric acid with a pH value between 1.5 and 3.5, which is extremely acidic. This acid is powerful enough to actually dissolve many metals, including those found in razor blades. The body protects the stomach walls with a thick mucous lining that regenerates quickly, preventing the stomach from dissolving itself.
π§ Adults β’ Human Body
The body's smallest muscle is in the eye and controls the pupil.
π‘ Explanation
False! The body's smallest muscle is the stapedius muscle (musculus stapedius), located in the middle ear and less than a millimeter long. Its job is to protect the inner ear from loud noises by dampening the vibrations from the stapes bone. The pupils in the eye are instead controlled by muscles in the iris.
π§ Adults β’ Human Body
The human body actually produces a faint form of light.
π‘ Explanation
It's true! The human body actually emits a form of light, known as biophoton emission. However, this light is extremely faint β about 1,000 times weaker than what the human eye can perceive. The light is a byproduct of chemical reactions inside our cells, especially during metabolism. Scientists have used highly sensitive cameras to capture this invisible glow, which varies in intensity throughout the day. So, even if we can't see it with the naked eye, we literally glow!
π¦ Kids β’ Human Body
Humans only use 10% of their brain.
π‘ Explanation
That's a common myth! We actually use almost our entire brain, even when we're sleeping. Different parts of the brain are active at different times so we can think, feel, move, and learn new things. No part is useless, and the brain is always busy!
π¦ Kids β’ Human Body
You are born with more bones in your body than you have when you grow up.
π‘ Explanation
That's true! Babies are born with about 300 bones. As you grow up, many of these small bones fuse together, becoming fewer but stronger. That's why an adult human only has 206 bones. It's also why babies are so soft and flexible when they're little!
π¦ Kids β’ Human Body
Your tongue is the strongest muscle in your entire body.
π‘ Explanation
Even though your tongue is super important for talking and eating, it's not the strongest! For example, the muscles in your jaw, which help you chew, can push your teeth together with more force. And the largest and most powerful muscle that can create the most overall force is the one you sit on β your gluteus maximus in your bottom!
