BRAIN TEASERS

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Find the right combination

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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Edison phonograph

In 1877, Thomas Edison demonstrated his hand-cranked phonograph that recorded sound onto tinfoil cylinders. Although 12 Aug 1877, is often given as the date of this invention, it may have been only at the stage of a sketch, since Edison did not file for the patent until 24 Dec 1877. The idea came to Edison while working on a telegraph transmitter, when he noted that when the the tape of the machine was played at high speed, it gave off a noise resembling spoken words. After experimenting with a needle attached to the diaphragm of a telephone receiver to prick paper tape to record a message, his idea evolved to using a stylus on a tinfoil cylinder.«*

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