What goes up and down the stai...
[2338] What goes up and down the stai... - What goes up and down the stairs without moving? - #brainteasers #riddles - Correct Answers: 41 - The first user who solved this task is Djordje Timotijevic
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What goes up and down the stai...

What goes up and down the stairs without moving?
Correct answers: 41
The first user who solved this task is Djordje Timotijevic.
#brainteasers #riddles
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First Date

A young man called his mother and announced excitedly that he had just met the woman of his dreams. Now what should he do?
His mother had an idea: "Why don't you send her flowers, and on the card invite her to your apartment for a home-cooked meal?"
He thought this was a great strategy, and a week later, the woman came to dinner. His mother called the next day to see how things had gone.
"I was totally humiliated," he moaned. "She insisted on washing the dishes."
"What's wrong with that?" asked his mother.
"We hadn't started eating yet."

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Ludwig Prandtl

Died 15 Aug 1953 at age 78 (born 4 Feb 1875).German physicist who is remembered for his studies of both aerodynamics and hydrodynamics. He established the existence of the boundary layer adjoining the surface of a solid over which a fluid flows. The design of an efficient shape, weight, and mass for ships and aircraft owes much to his work, for which he is considered to be the father of aerodynamics. His made major studies on the effects of streamlining and the properties of aircraft wings. He made improvements to such constructions as wind tunnels. The Prandtl number is a dimensionless group used in the study of convection. The von Karman-Prandtl equation describes the logarithmic variation of water velocity within a channel from zero flow at the stream bed to a maximum velocity at the water surface.
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