"The glass of water weighs how much?" "50 grams!" ... "100 grams!" ... "125 grams!" ... the students answered. "I do not know exactly if not balanced". Professor said: "But my question is:" What will happen if I keep holding this cup in a few minutes ...? " "Nothing," the student said. "OK, so what happens if I stretched out in an hour? "Professor asked. "Your arm would begin to ache, sir," replied one student. "Yes, and if one day, why?" "Your arm may be numb, and he can muscle pain, numbness, be sure to go to the hospital. " Another student said the whole liver. And laugh all classes. "Very good. But in all such cases, the weight of the glass change? "Section. The professor asked. "No, sir." The student replied. "So, what makes the hand pain, muscle paralysis? And instead of just took forever, what should I do? " The students confused. Then someone said, 'Put the jug down!' "Exactly!" professor said: "The problems in life like this. When you hold it in the first few minutes is okay. Think more, they hurt you. And if you try to keep more, they begin to paralyze you. And you will not be able to do anything. "
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