A lot of people have been asking me about the discovery announced this week about cosmic inflation. As I mentioned in my recent news post, you can find many good articles about it, and one of my favorites is this one from Phil Plait. Still, I realized that most people need a little more explanation of some basic concepts — such as of the ideas behind the “expanding universe” and the “Big Bang” — in order to understand the discovery and what it means. For that reason, I’ve put together the video below (or watch on Youtube) to try and provide the necessary context. My apologies for it being a bit rough, but hope you will find it useful.