What Keeps the Heart Beating Without Ever Stopping to Rest?
Every other muscle in the human body eventually gives out. Run up a few flights of stairs and your legs will burn. Grip a pull-up bar too long…
-
-
Why Do Volcanoes Suddenly Erupt?
At 8:32 a.m. on May 18, 1980, Mount St. Helens looked almost exactly as it had a minute earlier: a snow-covered cone in southwestern Washington, bulging slightly on…
-
Why Did Darwin Wait Twenty Years to Publish On the Origin of Species?
In the summer of 1858, Charles Darwin sat at his family home in Kent, mourning the recent death of his infant son from scarlet fever, while a small…
-
Why Do Humans Age? The Cellular Damage the Body Can No Longer Outrun
Every second, your body replaces roughly two million red blood cells. Over a lifetime, your skin regenerates itself dozens of times over, your gut lining rebuilds itself every…
-
Why Even Geniuses Struggle to Understand Quantum Mechanics
In 1965, Richard Feynman won the Nobel Prize in Physics for helping build the mathematical foundation of quantum electrodynamics, one of the most accurate theories humans have ever…
-
Why Haven’t We Found Aliens? The Question Fermi Asked Over Lunch
In the summer of 1950, four physicists sat down to lunch at Los Alamos National Laboratory and started talking about flying saucers, which were then a fixture of…
-
How Can a Single Electron Take Two Paths at Once?
Fire a single electron at a wall with two narrow slits cut into it, and something happens that no ordinary object should be able to do. The electron…
-
How Stars Are Born, Shine, and Die
Every atom of calcium in your bones and every atom of iron in your blood was made inside a star that died before the sun existed. That is…
-
Why Stress Hits Your Heart and Stomach Before It Hits Anything Else
Someone waiting to walk into a job interview often notices two things happening at once: a heartbeat that feels too loud for the room, and a stomach that…
