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Calculate the number 1564

NUMBERMANIA: Calculate the number 1564 using numbers [8, 4, 5, 1, 91, 717] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 28

The first user who solved this task is Erkain Mahajanian.

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The math teacher saw that Daph...

The math teacher saw that Daphne wasn't paying attention in class.
She called on her and said, "Daphne! What are 2 and 4, and 28 and 44?"
Daphne quickly replied, "ABC, CBS, HBO and the Cartoon Network!"

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Centennial of Chemistry

In 1874, the Centennial of Chemistry in the U.S. was celebrated by chemists meeting at Northumberland, Pa. where Joseph Priestley was buried after spending the last years of his life in America. The chemists commemorated the 100th anniversary of Priestley's discovery of the element oxygen on 1 Aug 1774, regarded as the most important link in the chain of events which eventually led to the overthrow of the phlogistic hypothesis. The memorial exercises were planned to include an address by Professor Joseph Henry, an Essay on American Contributions to Chemistry by Benjamin Silliman, Jr., and a loan exhibition of Priestley's apparatus, books and manuscripts. The event was initiated by Henry Bolton.«

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