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Khoi Nguyen

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last 3 solved tasks
Tricky math! Can you solve this? If 11+11=4 and 12+12=9 Then 13+13=?
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 schoolgirl approaches her mo...

A schoolgirl approaches her mother and announces, "Mommy, I know where babies come from!"
"And where is that?" her mother asks.
"Well, Mommy and Daddy take their clothes off and Daddy's thingy sort of sticks out and Mommy puts it in her mouth and that's how you get babies," she explains.
"Oh darling, that's so sweet, but that's not how we get babies," her mother replies, "That's how we get flowers, jewelry, clothes and shoes!"
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