MATH PUZZLE: Can you replace...
[3313] MATH PUZZLE: Can you replace... - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 401 - The first user who solved this task is Fazil Hashim
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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 401
The first user who solved this task is Fazil Hashim.
#brainteasers #math #riddles
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A young man at this constructi...

A young man at this construction site was bragging that he could outdo anyone based on his strength. He especially made fun of one of the older workman. After several minutes, the older worker had enough. 
"Why don't you put your money where you mouth is?" he said. "I'll bet a week's wages that I can haul something in a wheelbarrow over to the other building that you won't be able to wheel back." 
"You're on, old man," the young man replied. "Let's see what you've got." 
The old man reached out and grabbed the wheelbarrow by the handles. Then nodding to the young man, he said with a smile, "All right. Get in."
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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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