Replace the question mark with a number
[3215] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 451 - 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: 451
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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After trying a new shampoo for...

After trying a new shampoo for the first time a man fired off an enthusiastic letter of approval to the manufacturer.
Several weeks later he came home from work to a large carton on his porch. Inside were free samples of the many products the company produced: soaps, detergents, tooth paste, and paper items, etc.
"Well, what do you think?" his wife asked smiling.
"Next time," he replied. "I'm writing to General Motors!"
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Perkin patent for aniline dye

In 1856, William Henry Perkin, an English chemist, applied for a British patent titled "Dyeing Fabrics" for his invention of aniline dye "producing a new coloring matter for dyeing with a lilac or purple color stuffs of silk, cotton, wool or other materials." It was sealed on 20 Feb 1857. This was the first synthetic dye, which he obtained at first unintentionally from coal tar (a by-product of coal gas production) while seeking a method to prepare the anti-malarial drug quinine from that source. Perkin was just 18 years old. With help from his father and brother, he began manufacturing the dye, which he called Tyrian purple. Within a few years, he was wealthy and in in 1873 sold the business to turn to chemistry full-time.«
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