The Mpemba Effect was first discovered by a Tanzanian student while making ice cream in 1969. The Mpemba Effect is the phenomenon whereby hot water can, under certain conditions, freeze faster than cold water.
Scientists have identified a number of factors to explain the Mpemba effect (conduction, evaporation and convection) but so far all the theories are only speculative.
However, back in 2013 Xi Zhang and his colleagues from the Nanyang Technological University in Singapore, found evidence which suggests that it's the chemical bonds that hold water together which provide the strange effect.
Paper:http://arxiv.org/abs/1310.6514
Articles:http://www.wired.com/2014/05/whats-up-with-that-mpemba-effect/
http://gizmodo.com/weve-finally-figured-out-why-hot-water-freezes-faster-1455906029
http://phys.org/news/2010-03-mpemba-effect-hot-faster-cold.html
Gif: Throwing boiling water at -41°C
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