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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It Takes A Long Time

Janice, my sister, had been pestering her husband, a carpenter, for more than a decade to build a screen door for the kitchen.
One day, to her delight, he built and installed one in less than two hours. It was both practical and pretty. She glanced towards the front door and wistfully remarked that one would look good there, as well.
"Are you kidding?" he gasped. "You can't just whip these things up, you know. It takes ten years to build a door like this."

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John Howard Northrop

Born 5 Jul 1891; died 27 May 1987 at age 95.American biochemist who received (with James B. Sumner and Wendell M. Stanley) the Nobel Prize for Chemistry in 1946 for successfully purifying and crystallizing certain enzymes, thus enabling him to determine their chemical nature. During WW I, he conducted research on fermentation processes suitable for the industrial production of acetone and ethyl alcohol. This work led to a study of enzymes essential for digestion, respiration, and general life processes. He crystallized pepsin (1930), a digestive enzyme present in gastric juice, and found that it is a protein, thus resolving the dispute over the nature of enzymes. Using the same chemical methods, he isolated the first bacterial virus (bacteriophage), and found it is a nucleoprotein (1938).
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