The Royal Society for Chemistry ran a competition to come up with an explanation: <a href="http:&#x2F;&#x2F;www.rsc.org&#x2F;learn-chemistry&#x2F;resource&#x2F;res00001018&#x2F;the-mpemba-effect?cmpid=CMP00007615" rel="nofollow">http:&#x2F;&#x2F;www.rsc.org&#x2F;learn-chemistry&#x2F;resource&#x2F;res00001018&#x2F;the-...</a>