Everyday Science Myths: What School Got Wrong

The psiandme Everyday Science Myths: What School Got Wrong quiz was created by psiandme.

One of the most pervasive myths in popular culture is the idea that humans only use ten percent of their brains. This concept has been the premise of blockbuster movies and countless self-help books promising to unlock our hidden potential. However, modern neuroimaging techniques, such as functional magnetic resonance imaging (fMRI) and positron emission tomography (PET) scans, have definitively proven this false. Neurologists have mapped the brain extensively and found that virtually every part of the brain has a known function. Even during sleep, our brains are highly active, performing crucial maintenance, memory consolidation, and regulatory tasks that keep our bodies functioning smoothly.

If you ask a primary school student how many senses humans have, they will confidently list five: sight, hearing, taste, touch, and smell. This Aristotelian classification has stuck around for centuries, but it represents a massive oversimplification of the human nervous system. Contemporary neuroscientists argue that we possess upwards of twenty distinct senses. These include proprioception, which is the awareness of where our body parts are in space, and nociception, the ability to feel pain. We also have specialized receptors for detecting temperature changes (thermoception) and maintaining our physical balance (equilibrioception). Recognizing these additional senses gives us a much deeper appreciation for how complex and capable the human body truly is.

When children draw the sun, they almost universally reach for a yellow crayon, a habit reinforced by how our star appears through Earth's atmosphere. The atmosphere scatters shorter wavelength light—like blue and violet—which is why the sky looks blue and the sun appears yellow, orange, or red depending on its position. However, if you were to travel into space and view the sun without the filter of our atmosphere, you would see its true color: a brilliant, blinding white. The sun emits all colors of the visible spectrum in roughly equal amounts, which combine to form white light. This fundamental misunderstanding of our own solar system highlights how our Earth-bound perspective can easily distort universal truths.

Another classic astronomical misconception involves the changing of the seasons. Many people intuitively assume that summer occurs when Earth is closest to the sun and winter happens when it is farthest away. While Earth's orbit is indeed elliptical, the variation in distance is relatively small and is not the primary driver of seasonal changes. The true cause is the axial tilt of our planet, which sits at an angle of approximately 23.5 degrees relative to its orbital plane. As Earth revolves around the sun, different hemispheres receive more direct sunlight at different times of the year. When the Northern Hemisphere is tilted toward the sun, it experiences summer, while the Southern Hemisphere experiences winter, completely independent of the planet's overall distance from our star.

Biology classes often use diagrams that color oxygen-rich blood red and oxygen-poor blood blue, leading to a widespread belief that deoxygenated blood inside our veins is actually blue. This myth is further reinforced by the bluish appearance of veins through our skin. In reality, human blood is always red. Oxygenated blood is a bright, vibrant cherry red, while deoxygenated blood is a darker, deeper crimson. The blue appearance of our veins is merely an optical illusion caused by the way light penetrates the skin and is absorbed and reflected back to our eyes. The skin absorbs lower-frequency red light and reflects higher-frequency blue light, deceiving our vision and perpetuating a biological falsehood.

Understanding why these myths persist is just as important as knowing the facts themselves. Often, these misconceptions stem from well-meaning educational simplifications that are necessary for teaching complex concepts to young children. Over time, these simplified models solidify into accepted facts, passed down through generations without question. By actively challenging these ingrained beliefs, we cultivate critical thinking and a deeper respect for the scientific method. Science is not a static body of knowledge but a continuously evolving process of discovery and refinement. Embracing the truth behind these everyday myths encourages a lifelong curiosity and a willingness to update our understanding of the world as new evidence emerges.

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