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Take a look at the picture of ...

Take a look at the picture of the movie scene and guess the name of the person whose face is not visible. Length of words in solution: 4,5

Correct answers: 36

The first user who solved this task is Manguexa Wagle.

#brainteasers #movie #film #cinemania

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Answering Machine Message 192

Hello, this is Ron. I'm not home right now, but I can take a message. Hang on a second while I get a pencil. (Open a drawer and shuffle stuff around.) OK, what would you like me to tell me?

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Crystal rectifier

In 1874, a paper by Ferdinand Braun (1850-1918) was published in the Annalen der Physik und Chemie describing his discovery of the electrical rectifier effect. He observed that certain crystals of metal sulphides have a larger or smaller resistance to an electric current, depending on its direction of flow. He used a galena crystal, a semiconductor material composed of lead sulfide. He found the rectifying effect especially true if at least one of the electrodes was a pointed wire. Thus, he had discovered the point-contact rectifier effect, the first semiconductor device. This effect wasn't used until over 30 years later in the form of the “cat's whisker”crystal radio detector which ultimately led to the point-contact transistor first produced in 1948.

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