Replace the question mark with a number
[3173] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 566 - The first user who solved this task is Sanja Šabović
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 566
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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Mail

A man was in his front yard mowing grass when his neighbor came out of the house and went straight to the mail box, opened it, then slammed it shut, and stormed back in the house.

A little later they came out again went to the mail box and again opened it, then slammed it shut again.

Angrily, back into the house they went.

As the man was getting ready to edge the lawn, the neighbor came out again, marched to the mail box, opened it and then slammed it closed harder than ever. Puzzled by his neighbors actions the man asked, "Is something wrong?"

To which the neighbor (who was not very computer savvy) replied, "There certainly is! My stupid computer keeps giving me a message saying, "YOU'VE GOT MAIL!"

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First successful steamboat

In 1783, the first successful steamboat, the Pyroscaphe, made a trial run on the River Saône in France. It was invented by a Frenchman, the Marquee Claude de Jouffroy d'Abbans. His earlier steam-powered boat tested in 1778 on the river Doubs used a Newcomen steam engine driving a hinged flap he modelled after the webbed feet of an aquatic bird, which was unsuccessful. He then built on ideas from James Watt's inventions to design a parallel-motion double-acting steam engine to drive a pair of large paddle wheels on the Pyroscaphe. Several thousand people viewed its trial, a 15 minute journey upstream on the River Saône. (Montgolfier's first balloon demonstration took place a few weeks earlier on 4 Jun 1783.)«
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