What causes the Mpemba effect?

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I have read many different explanations for the Mpemba effect. What is your take on it? What causes this effect? Let's discuss.
 
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Under fairly reasonable conditions, hot water will freeze faster than cold water.
 
I should have been more specific. Since everything I've read seems either conflicting or states "we just don't know" , I want to know what some people knowledgeable in physics think is the underlying cause(s) of this effect.