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Try to solve this mathematic...

Try to solve this mathematical puzzle. Find the missing number.

Correct answers: 99

The first user who solved this task is Djordje Timotijevic.

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When I was married, my wife us...

When I was married, my wife used to call me handsome. As a matter of fact, we are now divorced but she STILL calls me handsome.

Every time I have some money, she says, HANDSOME OVER.

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Berliner helicopter flight

In 1908, Emile Berliner (who invented the gramophone in 1887) in a trial of his first "test-rig" helicopter design, found it could potentially lift double its weight. While the Wright brothers were working on powered manned flight, by 1903, Berliner tested a 7-ft model rocket-powered airplane, which flew 40-ft before tumbling to ground. He began, in 1907, designing his helicopter with tandem intermeshing rotors. Although the Wrights by then had a successful rigid-wing aircraft, Berliner recognised the versatility of a helicopter. The 36-hp rotary engine he developed with the Adams-Farwell Company was the first application in aviation of the rotary engine, and had a weight advantage. He founded the Gyro Motor Company to promote rotary engines in aviation.«

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