The Mayan calender is real. The cycle that ends on Dec. 21st this year, the b’ak’tun, is a repeating cycle. When one b’ak’tun ends, another one starts. There are longer Mayan calendar cycles too, like the pictun, which is 20 b’ak’tuns. The pictun we’re in now ends in the 4772! So clearly they didn't think the world was ending in 2012. There’s also one cycle that lasts for 63 million years!