Rust-Free Gold
Why doesn't gold get rusty? (Gold oxide is less stable in air than gold itself.)
Why Is It?
Fever Chills
Why do you get chills when you have a fever? (Infection raises inner thermostat.)
Body Temperature
Why do we get hot even if the temperature isn't quite 98.6? (We generate our own heat and it's …
Center of Universe
Is there a black hole at the center of the universe? (The universe has no center.)
Magnetic Pole Flip
Why does earth's magnetic field reverse polarity? (Currents of molten iron flowing in the core)