The Mpemba effect, named after Erasto Batholomeo Mpemba (b.1950) in 1963, is the observation that, in some circumstances, warmer water can freeze faster than colder water. Although there is some conflicting published support for the effect, there is disagreement on exactly what the effect is and under what circumstances it occurs. There have been reports of similar phenomena since ancient times, although allegedly with insufficient detail for the claims to be replicated. A number of possibl The...
