What is abcd?
[160] What is abcd? - Author: Nebojsa Jevtovic - #brainteasers #math - Correct Answers: 100 - The first user who solved this task is Djordje Timotijevic
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What is abcd?

Author: Nebojsa Jevtovic
Correct answers: 100
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math
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Now Don't Get Nervous

Patient 1: “Why did you run away from the operation table?”

Patient 2: “The nurse was repeatedly saying ‘don’t get nervous’, ‘don’t be afraid’, ‘be strong’, ‘this is a small operation only’, things like that.”

Patient 1: “So what was wrong in that? Why were you so afraid?”

Patient 2: “She was talking to the surgeon!”

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Harold Stephen Black

Died 11 Dec 1983 at age 85 (born 14 Apr 1898).American electrical engineer who discovered and developed the negative-feedback principle, in which amplification output is fed back into the input, thus producing nearly distortionless and steady amplification. In 1921, Black joined the forerunner of Bell Labs, in New York City, working on elimination of distortion. After six years of persistence, Black conceived his negative feedback amplifier in a flash commuting to work aboard the ferry. Basically, the concept involved feeding systems output back to the input as a method of system control. The principle has found widespread applications in electronics, including industrial, military, and consumer electronics, weaponry, analog computers, and such biomechanical devices as pacemakers.
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