Why is the sky dark at night? You might think the answer is obvious - the sun isn't up! But the only reason the sky looks blue during the day is that sunlight scatters off of the atmosphere -...
In our everyday world, we're used to absolute, deterministic predictions: throw a ball in the air, and it'll fall along an ellipse; leave your umbrella parked on the street, and when...
Suppose you're ambitious enough to try to describe everything in the observable universe in one single mathematical equation. DONE. OK, so that doesn't include gravity or a few other...