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Calculate the number 721

NUMBERMANIA: Calculate the number 721 using numbers [2, 4, 2, 7, 49, 231] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 10

The first user who solved this task is Nasrin 24 T.

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Fairy tales...

When Chelsea Clinton was eight, Hillary was reading one of her favorite fairy tales.

"Mommy," asked Chelsea, "Do all fairy tales begin with "Once Upon a Time...?""

"No, dearest," replied Hillary, "sometimes they start with 'Darling, I have to work a little late at the office tonight...'"

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Ross F. Nigrelli

Born 12 Dec 1903; died 4 Oct 1989 at age 85.Ross Franco Nigrelli was an American marine biologist who was an expert on diseases of sea life, and was first to discover virus-induced tumours in fish. He investigated plankton blooms, such as the red tides of the 1940s along Florida's Gulf Coast that caused a die-off of millions of fish. He studied how the health of marine organisms was affected by, as well as changes in salinity or water temperature. As one of the earliest systematic researchers of venoms released by some marine life, and their uses of their extracts as sources of useful drugs. For example, he discovered that a secretion of Bahamian sea cucumbers that was fatal to fish, even in minute quantities. Yet, it could slow the growth of tumours in mice. He also found that certain secretions of sea sponges had antibacterial properties, and that the blood of horseshoe crabs could detect blood poisoning in humans.«

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