Mpemba Effect

[On Radioactive Waves]

I have read many different explanations for the Mpemba effect. What is your take on it? What causes this effect? Lets discuss.

[Alexander]

What is Mpemba effect?

[Hurkyl]

Under fairly reasonable conditions, hot water will freeze faster than cold water.

[On Radioactive Waves]

I should have been more specific. Since everything I've read seems either conflicting or states "we just dont know" , I want to know what some people knowledgable in physics think is the underlying cause(s) of this effect.