At roughly minus 460 F, absolute zero is abysmally cold, yet at least we can imagine it. Being only a few hundred degrees below zero, it's in the realm of something we can put our minds around.

Pioneers in the quest to reach absolute zero relied on a technique known as the "cascade" process. First, they put a gas in a sealed container under high pressure, then cooled the compressed gas ...

(via SciShow) It's impossible to have something colder than absolute zero...right? That's why it's called "absolute zero". Well, it turns out you can get certain substances to negative absolute ...