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Calculate the number 8175

NUMBERMANIA: Calculate the number 8175 using numbers [6, 4, 5, 7, 41, 913] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 2

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A secretary walked into her bo...

A secretary walked into her boss's office and said, "I'm afraid I've got some bad news for you."
"Why do you always have to give me bad news?" he complained. "Tell me some good news for once."
"Alright, here's some good news," said the secretary. "You're not sterile."

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Fluoridation

In 1967, the first fluoridation law in the U.S. went into effect in Connecticut, requiring fluoridation of public water supplies serving 20,000 or more population, to prevent dental caries. The water fluoridation era began in 1945 when the cities of Newburgh, New York, and Grand Rapids, Michigan, began adding sodium fluoride to their public water systems. This followed the work done (1930-1943) by Frederick S. McKay, a Colorado dentist, who related brown stains (mottling) on his patients' teeth to low dental caries due to the source of their drinking water containing high levels of naturally occurring fluoride. By the early 1940s, H. Trendley Dean had determined the ideal level of fluoride in drinking water to reduce decay without mottling.

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