Find number abc
[6717] Find number abc - If aa1bb - 4bcab = 31480 find number abc. Multiple solutions may exist. - #brainteasers #math - Correct Answers: 19 - The first user who solved this task is Nílton Corrêa de Sousa
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Find number abc

If aa1bb - 4bcab = 31480 find number abc. Multiple solutions may exist.
Correct answers: 19
The first user who solved this task is Nílton Corrêa de Sousa.
#brainteasers #math
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Ballpen in space

When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity.
To combat the problem, NASA scientists spent a decade and $12 billion to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300 C.
The Russians used a pencil.

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First British pillar box

In 1852, the first of four British pillar boxes was installed at Jersey's capital, St. Helier. The red cast iron free-standing boxes were used as a street-side receptacles of letters ready for collection by the Post Office. Anthony Trollope (later a famous novelist) was a Surveyor's Clerk who recommended their use after being sent to inspect Channel Islands postal services in 1851. He did not invent the pillar box, which had first appeared in Belgium, but he prompted their use in Britain. After approval by the Postmaster- General, the first pillar box on the English mainland was installed in Carlisle in 1853. London had six installed on 11 Apr 1855.*«[Image, right: The hexagonal box as designed and cast by St. Helier blacksmith John Vaudin]
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