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Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.

Correct answers: 24

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

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First U.S. advertisement for a radio receiver

In 1906, this date is sometimes given for the first U.S. advertisement for a radio receiver. However, the earliest one-inch advertisement for the Telimco appeared in the 25 Nov 1905 issue of the Scientific American. Both these, and several similar weekly advertisements in between, were run by Hugo Gernsback of The Electro Importing Company of New York. It seems that Gernsback himself appeared to have forgotten the exact date on which the first Telimco advertisement appeared. The Electro Importing catalogs from the mid-teens state that the ads premiered in Scientific American in Nov 1905. However, in a special issue of Radio Craft published in Mar 1938, Gernsback gave the date as 13 Jan 1906.

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