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Mathematical Puzzle: IF 23+4...

Mathematical Puzzle: IF 23+478-593=5.588 and 1389+99-29=34.364 THEN 87+57-56=?

Correct answers: 16

The first user who solved this task is Erkain Mahajanian.

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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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Quasar

In 1962, a lunar occultation on August 5 enabled Australian radio astronomers to more precisely fix the location of the previously known radio source 3C 273, in Virgo. In 1963 this became the first member of a new class of object eventually to be called quasars or "quasi-stellar radio sources." Maarten Schmidt, using the Hale optical telescope, saw it as a faint star-like object with a visible jet. Its spectrum featured unusual emission lines, which he identified as ordinary hydrogen lines shifted toward longer wavelengths (redshifted) by 16%. If the shift is due to velocity, it is moving away at one-sixth the speed of light and one of the most distant objects visible. Quasars radiate as much energy per second as a hundred or more galaxies. 3C273 is the brightest quasar known.

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