S2, E4: Three incredible stories that could spell the end of human life on Earth: Decoding ancient Mayan texts, a physicist predicts a huge cataclysm will destroy the world in 2012 and believes the culprit is a deadly super-volcano lurking beneath Yellowstone National Park; a NASA scientist makes an incredible alien discovery and believes a solar storm could destroy the planet; and, one of the world’s greatest minds makes a startling prediction about a sinister robot takeover — man and machine will merge by 2050.