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Calculate the number 250

NUMBERMANIA: Calculate the number 250 using numbers [2, 5, 1, 7, 57, 138] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 35

The first user who solved this task is Sanja Šabović.

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Brian Regan: Unilingual

Can you imagine being bilingual? Or even knowing anybody that was? Im not even unilingual. Actually, I shouldnt say that. I dont give myself enough credit. I know enough English to, you know, get by. I can order in restaurants and stuff.

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Manne Siegbahn

Born 3 Dec 1886; died 26 Sep 1978 at age 91.Karl Manne Georg was a Swedish physicist who was awarded the Nobel Prize for Physics in 1924 for his discoveries and investigations in X-ray spectroscopy. In 1914 he began his studies in the new science of x-ray spectroscopy which had already established from x-ray spectra that there were two distinct 'shells' of electrons within atoms, each giving rise to groups of spectral lines, labeled 'K' and 'L'. In 1916, Siegbahn discovered a third, or 'M', series. (More were to be found later in heavier elements.) Refining his x-ray equipment and technique, he was able to significantly increase the accuracy of his determinations of spectral lines. This allowed him to make corrections to Bragg's equation for x-ray diffraction to allow for the finer details of crystal diffraction.

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