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Leonhard EulerDied 18 Sep 1783 at age 76 (born 15 Apr 1707). Leonhard Paul Euler was a Swiss mathematician and physicist, one of the founders of pure mathematics. He not only made decisive and formative contributions to the subjects of geometry, calculus, mechanics, and number theory but also developed methods for solving problems in observational astronomy and demonstrated useful applications of mathematics in technology. At age 28, he blinded one eye by staring at the sun while working to invent a new way of measuring time. 
At school, a boy is told by a...
At school, a boy is told by a classmate that most adults are hiding at least one dark secret, and that this makes it very easy to blackmail them by saying, "I know the whole truth" even when you don't know anything.
The boy decides to go home and try it out. As he is greeted by his mother at the front door he says, "I know the whole truth." His mother quickly hands him $20 and says, "Just don't tell your father."
Quite pleased, the boy waits for his father to get home from work, and greets him with, "I know the whole truth." The father promptly hands him $40 and says, "Please don't say a word to your mother."
Very pleased, the boy is on his way to school the next day, when he sees the mailman at his front door. The boy greets him by saying, "I know the whole truth."
The mailman drops the mail, opens his arms and says, "Then come give your FATHER a big hug!"
The boy decides to go home and try it out. As he is greeted by his mother at the front door he says, "I know the whole truth." His mother quickly hands him $20 and says, "Just don't tell your father."
Quite pleased, the boy waits for his father to get home from work, and greets him with, "I know the whole truth." The father promptly hands him $40 and says, "Please don't say a word to your mother."
Very pleased, the boy is on his way to school the next day, when he sees the mailman at his front door. The boy greets him by saying, "I know the whole truth."
The mailman drops the mail, opens his arms and says, "Then come give your FATHER a big hug!"