Calculate the number 813
[5912] Calculate the number 813 - NUMBERMANIA: Calculate the number 813 using numbers [3, 5, 2, 6, 74, 605] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 13 - The first user who solved this task is Nílton Corrêa De Sousa
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Calculate the number 813

NUMBERMANIA: Calculate the number 813 using numbers [3, 5, 2, 6, 74, 605] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 13
The first user who solved this task is Nílton Corrêa De Sousa.
#brainteasers #math #numbermania
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A mother, accompanied by her s...

A mother, accompanied by her small daughter, was in New York City. The mother was trying to hail a cab, when her daughter noticed several wildly dressed women who were loitering on a nearby street corner.
The mother finally hailed her cab and they both climbed in, at which point the young daughter asks her mother, "Mommy, what are all those ladies waiting for by that corner?"
The mother replies, "Those ladies are waiting for their husbands to come by and pick them up on the way home from work."
The cabby, upon hearing this exchange, turns to the mother and says, "Ah, C'mon lady! Tell your daughter the truth! For crying out loud...They're hookers!"
A brief period of silence follows, and the daughter then asks, "Mommy, do the hooker ladies have any children?"
The mother replies, "Of course, Dear. Where do you think cabbies come from?"
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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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