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Go to: http://www2.binghamton.edu/physics/docs/Royal%20Society%20Mpemba%20effect%20Final%20%2010%20Aug%2012%20%201.pdf for the answer. Blue Spruce

Yes you are correct, the effect was re-discovered my Mr. Mpemba when he was a student. A “proper test” would be to test the hot and cold water samples at the same time in the same freezer while maintaining all conditions except sample temperatures as identical as possible until both samples...

You that is correct.

The Mpemba effect is caused by impurities in the water or on the surface of the containers holding the water. For experimental results that support this conclusion see: “When does hot water freeze faster then cold water? A search for the Mpemba effect.” by James D. Brownridge in the...