Calculate the number 2539
[7868] Calculate the number 2539 - NUMBERMANIA: Calculate the number 2539 using numbers [6, 8, 3, 9, 32, 251] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 2
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Calculate the number 2539

NUMBERMANIA: Calculate the number 2539 using numbers [6, 8, 3, 9, 32, 251] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 2
#brainteasers #math #numbermania
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Magic Window

Two guys are sitting at a bar.

"You know why I love this bar?" asks the first one.

"No," says the second guy. "Why do you love this bar?"

The first guy points at the window, which is six stories above the ground. "It has a magic window," he says. "You jump out of that window, and you can fly."

The second guy just shakes his head. "Shut up."

"No," says the first guy. "It really is a magic window. I'll prove it to you."

So the first guy gets down from his bar stool, runs at the window, jumps out of it, and flies. He flies around the building twice, up and down, and finally comes back in. He walks to his barstool, and takes a sip of his drink. "See?" he says.

The first guy looks confused. He looks at his drink. "I must be drunk," he says.

"Still don't believe me?" asks the second guy. "I'll show you again." He gets down from his stool, runs and jumps out of the window again. This time he performs some impressive aerial acrobatics, spins, flips, dives. When he finally comes back in, the second guy is staring at him, slack-jawed.

"Wow," says the second guy. "A magic window." He gets off his barstool, takes a running jump out of the window, and promptly plummets to his death. The first guy starts laughing.

The bartender comes over to the first guy with a stern look on his face. "Superman, you're a real asshole when you're drunk."

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Hans Joachim Pabst von Ohain

Died 13 Mar 1998 at age 86 (born 14 Dec 1911).German aeronautical engineer who designed the first operational jet engine. Ohain, at age 22, conceived his theory of jet propulsion (1933) because to fly faster, airplanes could fly higher for lower air resistance, but there, propellers and piston engines worked badly. He saw turbojets as a solution, and took out his first patent on the gas-turbine jet engine in 1935, four years after Frank Whittle. By Sep 1937, Ohain had a hydrogen-fueled bench model producing a 250-km thrust. He designed the HeS3b turbojet engine that powered the first experimental jet aircraft, the He178, on its historic maiden flight at a top speed of about 350 mph on 27 Aug 1939, near Rostock, Germany. Whittle's first jet flew later, in 1941. His continued work on the gas-turbine engine during World War II resulted in abandonment of the centrifugal flow concept, and adoption of the axial flow compressor type engine. After WW II, Ohain worked for the U.S. airforce (1947-79). In 1945, he emigrated to the U.S. and became an engineer for the U.S. Air Force at its engine development centre. In 1956, Von Ohain became Director of the famed Air Force Aeronautical Research Laboratory.
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