Replace the question mark with a number
[3440] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 251 - The first user who solved this task is Snezana Milanovic
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 251
The first user who solved this task is Snezana Milanovic.
#brainteasers #math #riddles
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Gallery Sale

An artist asked the gallery owner if there had been any interest in her paintings that were on display.
"Well, I have good news and bad news," the owner responded. "The good news is that a gentleman noticed your work and wondered if it would appreciate in value after your death. I told him it would and he bought all 10 of your paintings."
"That's wonderful," the artist exclaimed. "What's the bad news?"
"The gentleman was your doctor." 

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First U.S. antifouling paint patent

In 1863, the first U.S. patent for an antifouling paint for ships' hulls was issued to J.G. Tarr and A.H. Wonson (No. 40515) for a copper oxide, tar and naptha mixture. They claimed that a ship's hull thus painted could have protection against growth of barnacle shells and seaweeds lasting "for a period of twelve months, while another vessel painted in the common manner and employed in the same trade became so foul in six weeks as to require scraping." They took out an anti-corrosion antifouling paint patent on 13 Jun 1865 (U.S. No.48221). Fouling of a ship's bottom was a serious problem because it increases drag and greatly reduces a ship's speed. A British antifouling paint patent was issued on 31 Aug 1625 to William Beale.«
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