A special expanded edition of 20/20 that chronicles 7 of the deadliest threats to humanity. It starts at number 7 (least likely), the death of stars, including the risk of gamma ray bursts a... Read allA special expanded edition of 20/20 that chronicles 7 of the deadliest threats to humanity. It starts at number 7 (least likely), the death of stars, including the risk of gamma ray bursts and black holes. Intelligent machines and the threat of our own technology turning against ... Read allA special expanded edition of 20/20 that chronicles 7 of the deadliest threats to humanity. It starts at number 7 (least likely), the death of stars, including the risk of gamma ray bursts and black holes. Intelligent machines and the threat of our own technology turning against us lands at number 6. Five is the inevitability of a super-volcano eruption, specifically ... Read all