把一杯热水和一杯冷水放在冰箱中，是热水先结冰还是冷水先结冰？一般认为，当然是冷水先结冰，错了！应该是热水先结冰，发现这个现象的是坦桑尼亚的一位中学生．坦桑尼亚某中学，非常重视开展课外活动，夏天学校组织学生自己动手制冰淇淋，用开水冲上一杯牛奶，待它冷却后放 Put a cup of hot water and a glass of cold water in the refrigerator. Is hot water frozen first or cold water is frozen? It is generally believed that, of course, cold water first freezes, and it is wrong! It should be hot water before it freezes. It is a junior high school student in Tanzania. A secondary school in Tanzania attaches great importance to extra-curricular activities. In summer, the school organizes students to make their own ice cream, rinse with boiling water, and let it cool down.