A material to marvel at

Many properties of water are not fundamentally understood. They play a crucial role in life on earth. Scientists are about to finally unravel the mysteries.

by JAN BERNDORFF

13-year-old Erasto Mpemba was a little late that school day in 1963. In the science class at Magamba Secondary School in Tanga, Tanzania, the students were supposed to make ice cream. To do this, they had dissolved sugar in hot milk and were supposed to put it in the refrigerator after it had cooled down. Mpemba's milk was still warm while the others were already putting their mugs in the fridge, that

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