In case you haven't heard, our planet is as flat as a pancake. Sound crazy? Perhaps. But around the globe (disc?) a flat Earth movement is steadily on the rise. More and more people, educated and not, from all walks of life, are posting videos, attending conferences, and publishing books embracing this seemingly radical notion.

NBA all-stars like Kyrie Irving and Shaquille O'Neal have publicly supported the idea. Rapper B.o.B is funding a satellite launch to prove it. And if that's not enough to convince you, know that social media and television star Tia Tequila is also a believer!

Is this just some strange new celebrity fad like Scientology, or is it a larger symptom of the post-truth, alternative facts era we're living in? This hour we look inside the flat Earth movement with believers and non-believers alike to find out.