BRAIN TEASERS

# MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?
The first user who solved this task is Erkain Mahajanian.
#brainteasers #math #riddles

### A young boy enters a barbersho...

A young boy enters a barbershop and the barber whispers to his customer, "This is the dumbest kid in the world. Watch while I prove it to you."
The barber puts a dollar bill in one hand and two quarters in the other, then calls the boy over and asks, "Which do you want, son?"
The boy takes the quarters and leaves.
"What did I tell you?" said the barber. "That kid never learns!"
Later, when the customer leaves, he sees the same young boy coming out of the ice cream store. "Hey, son! May I ask you a question? Why did you take the quarters instead of the dollar bill?"
The boy licked his cone and replied, "Because the day I take the dollar, the game's over!"
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### Stirling patent

In 1816, Robert Stirling, age 26, applied for a patent for his "Heat Economiser" at the Chancery in Edinburgh, Scotland (No. 4081/1816). The patent described principles of heat regeneration to reduce fuel consumption in glass and other furnaces, with elements of what is now called the Stirling Cycle engine. The regenerative principle was to save fuel by heating the air required for combustion with the waste heat of the funace. The hot air or caloric engine design in his 1816 patent "came to nothing." His regenerative furnace system was crude, but made practical by Siemens forty years later. By 1 Feb 1827, Stirling took out another patent for a caloric engine which worked successfully (No. 5456) and again on 1 Oct 1840 (No. 8652).«
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