Prophecy
Scientists sometimes make predictions about the future. These may be correct but often are wrong or only partly correct.  The famous inventor Thomas Edison predicted that electricity would replace steam as a way to power trains, but he also predicted that gold could be made from iron, making it worth little as money.  Einstein said in 1932 that atomic energy would never be possible.  Politicians also make prophecies that may or may not prove to be true. Adolph Hitler predicted that the Nazis would rule for 1000 years, but they were defeated in only 12 years(1933-1944).  Many organizations try to predict the outcome of elections, with very mixed accuracy.  Others predict the winners of sporting events, but are often wrong. Games with unexpected results are called "upsets". A famous baseball player, Yogi Berra once said that "It's tough to make predictions, especially about the future".