Replace the question mark with a number
[2497] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 177 - The first user who solved this task is Donya Sayah30
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 177
The first user who solved this task is Donya Sayah30.
#brainteasers #math #riddles
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Being Alone


A man moved to a mountain top to get rid of the hustle and be alone.

One day he heard a knock at the door and no one was there but then he looked down and there sat a snail and it said "it is quite cold out here can I come in?" the man shouted "NO why don¡¯t you all understand I want to be alone!" and he kicked the snail down the mountain.

One year later there was a knock at the door and no one was there and then he looked down and there again sat a snail and it said,

"What did you do that for?"

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First refracting telescope

In 1608, Johannes Lippershey (c.1570-c.1619) demonstrated a new invention, the first optical (refracting) telescope - prototype of the modern telescopes - to the Netherlands States General. Lippershey was a lens grinder who furnished spectables. An apprentice discovered that - by separating both a long-focus lens and a short-focus lens in front of the eye - distant objects appeared closer. Lippershey mounted lenses in tubes, applied for a patent in 1608, and also offered them for sale to the Dutch government, which appreciated their military value. When Galileo heard of the device, he made a similar arrangement and used it to study the heavens. It was named a "telescope" by a guest at an outdoor banquet 14 Apr 1611 honouring Galileo, where he demonstrated it to the assembly.«
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