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Hứa Toàn Phong

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MATH PUZZLE: Can you replace the question mark with a number?

Erasmus Reinhold

Born 22 Oct 1511; died 19 Feb 1553 at age 41. German mathematician who was a leading mathematical astronomer in his time. He carefully calculated the first set of planetary tables applying Copernican theory, published in 1551. They were named after his financial supporter (Albert, Duke of Prussia) as the Tabulae Prutenicae. Although Reinhold's work furthered the acceptance of Copernican views, he expressed no enthusiasm for the heliocentric assumption. He merely accepted it for having merit as a mathematical device yielding practical results. His tables were superceded in three-quarters of a century by Kepler's improvements.«

Confuse Traffic Signs

A cop pulls over a carload of nuns.
Cop: "Sister, this is a 65 MPH highway -- why are you going so slow?"
Sister: "Sir, I saw a lot of signs that said 22, not 65."
Cop: "Oh sister, that's not the speed limit, that's the name of the highway you're on!
Sister: Oh! Silly me! Thanks for letting me know. I'll be more careful.
At this point the cop looks in the backseat where the other nuns are shaking and trembling.
Cop: Excuse me, Sister, what's wrong with your friends back there? They're shaking something terrible.
Sister: Oh, we just got off of highway 119.
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