India, April 26 -- For decades, entire groups of people have misremembered the same specific things. This unsettling glitch-in-the-matrix-style phenomenon is called the Mandela Effect, from the fact that many people, in the Aughts, had the inexplicable "memory" of South Africa's anti-apartheid hero Nelson Mandela dying. Some recalled a funeral; others "remembered" reading about riots that followed. (Mandela died in 2013.) Along similar lines, Mr Monopoly doesn't have a monocle. (The Planters food company mascot, Mr Peanut, does.) Pikachu's tail doesn't have a black tip. (His ears do.) Researchers studying the Mandela Effect have been unable to conclusively explain what makes some misremembered details so widespread. Explanations among seeke...