1963年,坦桑尼亚的马干巴中学初三年级的学生姆潘巴在偶然的机会中发现:热牛奶与冷牛奶同时放到冰箱里,热牛奶已经结成了冰,而冷牛奶还是很稠的液体,没有冻结.这个现象使姆潘巴惊愕不已!他去请教物理老师,老师的回答是:“你一定弄错了,这样的事是不可能发生的.”进了高中,他又拿着这个问题去请教物理老师,仍未得到满意的回答.事隔不久,碰到了一个极好的机会—达累斯萨拉姆大学物理系主任奥斯玻恩博士访问 In 1963, Mpamba, a third-year student at Maganba Junior High School in Tanzania, discovered by chance that hot milk and cold milk were put into the refrigerator at the same time. Hot milk had already become ice, and cold milk was a very thick liquid. There was no freezing. This phenomenon made Mpemba very surprised! He went to consult a physics teacher. The teacher’s answer was: “You must be mistaken. Such a thing is impossible.” “In high school, he took it again. Asking the physics teacher about this problem has not yet received a satisfactory answer. Shortly afterwards, I met an excellent opportunity — Dr. Osborn, Director of the Physics Department of the University of Dar es Salaam.