Depending on where you live, you might be hearing (or seeing on Twitter) the words "polar vortex" quite a lot. If you're not sure what it means, Vanessa Hudgens is here to demonstrate! Watch as she takes a cup of boiling water and chucks it into the air. The result is mind-blowing.
So long story short: "polar vortex" means, in most parts of the United States, it's really, REALLY cold!