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Sami Rizk

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last 3 solved tasks
What number goes into the empty square?
MATH PUZZLE: Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?

Denis Papin

Born 22 Aug 1647; died c. 1712 .French-English physicist who invented the pressure cooker (1679). He assisted Dutch physicist Christiaan Huygens with air-pump experiments, and went to London in 1675 to work with the English physicist Robert Boyle. A few years later, Papin invented his steam digester (pressure cooker), a closed vessel with a tightly fitting lid that confined the steam at a higher pressure, considerably raising the boiling point of the water. A safety valve of his own invention prevented explosions. Observing that the enclosed steam in his cooker tended to raise the lid, Papin conceived of the use of steam to drive a piston in a cylinder, the basic design for early steam engines. He never built an engine of his own, but his idea was improved by others and led to the development of the steam engine, a major contribution to the Industrial Revolution.

A young monk arrives at the mo...

A young monk arrives at the monastery. He is assigned to helping the other monks in copying the old canons and laws of the church by hand.
He notices, however, that all of the monks are copying from copies,not from the original manuscript. So, the new monk goes to the head abbot to question this, pointing out that if someone made even a small error in the first copy,it would never be picked up! In fact, that error would be continued in all of the subsequent copies.
The head monk, says, "We have been copying from the copies for centuries,but you make a good point, my son."
He goes down into the dark caves underneath the monastery where the original manuscripts are held as archives in a locked vault that hasn't been opened for hundreds of years. Hours go by and nobody sees the old abbot.
So, the young monk gets worried and goes down to look for him.He sees him banging his head against the wall and wailing.
"We missed the R!
We missed the R!
We missed the R!"
His forehead is all bloody and bruised and he is crying uncontrollably. The young monk asks the old abbot, "What's wrong, father?"
With A choking voice, the old abbot replies, "The word was..
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