Ivan Petrovich Pavlov. (№ 152799)

Remember that science demands from a man all his life. And if you had two lives, they would not be enough for you.
Quote Explanation: From a letter to I. P. to young people
Ivan Petrovich Pavlov
life science
№ 152799   Added MegaMozg 11-01-2017 / 11:45
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