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What is the center of gravity?

Correct answers: 75

The first user who solved this task is Neelima Subrahmanyam.

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A man has to leave the country...

A man has to leave the country on business and he entrusts with his best friend the job of keeping an eye on his wife. If anything out of the ordinary should occur, he was to be notified immediately.
After about a week of no news the business man received a telegram: "The man who comes to visit your wife every night didn't show up yesterday..."

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Black American patent

In 1897, a U.S. patent for an improvement in "Casting Composite or Other Wheels" was issued to black American inventor E.R. Robinson (No. 594,286). It gave a method for casting wheels wherein the outer sides are of one metal and the interior portions are of another metal. The importance was not only to enable casting a metal of high electrical conductivity, such as brass, in a groove of an iron trolley wheel - but also to permit an entirely new contruction consisting of two outer disks or flanges and an intermediate, uniting portion, which extends from the contact portion of the wheel with a web extending to the centre and an integral bushing. Robinson also held a previous patent, issued four years earlier, for an "electric railway trolley."[Image: plan view of bottom section of a wheel three-part mold]

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