Are we all just living in an elaborate simulation?

After movies like "The Matrix" (1999) posited the existence of a superficial world layered over our own, human imagination has run abound with theories about the nature of our reality. To a small but passionate minority, the red pill that can awaken us to this illusion is right at our fingertips.

World-renowned physicist Michio Kaku isn’t quite ready to take that pill. In fact, he’s skeptical that the pills even exist. He explains why.