How Do Optometrists Determine Your Glasses Prescription?
Optometrists determine your glasses prescription by measuring how your eye focuses light and then balancing that error with lenses until…
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Did T. rex Have Feathers and What Color Were They?
Adult Tyrannosaurus rex were likely mostly scaly, with no confirmed body-covering feathers, though small patches of simple filaments in juveniles…
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What Is mGluR5 and How Is It Linked to Autism?
mGluR5 is a metabotropic glutamate receptor that modulates how neurons respond to the excitatory neurotransmitter glutamate. A Yale-led brain imaging…
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Why Do Cats Purr (And What It Means)?
Cats purr because rhythmic activity in the voice box makes the vocal folds vibrate at low frequencies as the cat…
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How Much Oil Has Been Extracted From the Earth (and How Big Is That Volume?)
Humans have extracted on the order of 1.5 trillion barrels of oil to date. That is about 2.39×10^14 liters, or…
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What Is the “Dark Photon” Theory of Light and Does It Upend Quantum Mechanics?
The “dark photon” theory of light, as described in recent viral posts, is not a new particle and it does…
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What Is Comet 3I/ATLAS and What Have We Learned?
Comet 3I/ATLAS is an interstellar comet on a hyperbolic path that passed through our solar system in 2025. NASA and…
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What Are Cosmic Rays and How Are They Defined?
Cosmic rays are not a special new kind of particle. They are mostly high-energy charged particles, primarily protons and atomic…
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How Legionnaires’ Disease Spreads and How to Prevent It
Legionnaires’ disease spreads when people inhale tiny water droplets that contain Legionella bacteria, most often from large water systems such…
