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...
Matter is everywhere: we eat it, breathe it, drink it; it is who we are. But what is matter? The most basic particle physics definition of matter comes down to one surprising rule: the Pauli exclusion...
[Morgan Freeman] So. What are we really made of? Dig deep inside the atom and you'll find tiny particles held together by invisible forces. (held together by invisible forces.) Everything is made up...