Author, orator, and all-around ‘science guy’ Bill Nye has been asked a lot of questions in his 30 years on the air. But this time around, Bill gets asked a question almost Biblical in nature: is there such a thing as true free will? Of course, Bill gets right down to the nitty gritty and tells us what exactly is going on in our brains as we begin to make any decision. Is the idea of “choice” real or is choice just an idea in our heads? Are our brains inventing our own answers before we’ve even thought them through? The answer might surprise you. Bill Nye's most recent book is Unstoppable: Harnessing Science to Change the World.