Calculate the number 997
[3977] Calculate the number 997 - NUMBERMANIA: Calculate the number 997 using numbers [2, 9, 3, 2, 87, 478] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 16 - The first user who solved this task is Djordje Timotijevic
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Calculate the number 997

NUMBERMANIA: Calculate the number 997 using numbers [2, 9, 3, 2, 87, 478] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 16
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #numbermania
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The secret of my success

Grandpa was celebrating his 100th birthday and everybody complimented him on how athletic and well-preserved he appeared.

"Gentlemen, I will tell you the secret of my success," he cackled. "I have been in the open air day after day for some 75 years now."

The celebrants were impressed and asked how he managed to keep up his rigorous fitness regime.

"Well, you see my wife and I were married 75 years ago. On our wedding night, we made a solemn pledge. Whenever we had a fight, the one who was proved wrong would go outside and take a walk."

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First use of chemical symbols in British textbook.

In 1832, Edward Turner wrote a Preface to the 4th edition of his textbook, Elements of Chemistry (published 1833), in which he explained his use of symbols to represent reactants and products in a chemical reaction of Cyanogen, because he found they solved the difficulty of giving a “clear and concise description of. the phenomena in ordinary language.” His was the first use of chemical symbols in a British chemistry textbook. Turner used some algebra-type notation as suggested by William Whewell with parts of Jöns Jacob Berzelius's system, in which iron was represented by Fe (from Ferrum) and oxygen by O. Thus Fe + O represented one oxide of iron, and 2Fe + 3O represented another. Dots over the symbol indicated degree of oxidation, and an underline stood for two equivalents of a substance.«
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