What is bare in the winter and...
[2280] What is bare in the winter and... - What is bare in the winter and covered in the summer? - #brainteasers #riddles - Correct Answers: 114 - The first user who solved this task is Roxana zavari
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What is bare in the winter and...

What is bare in the winter and covered in the summer?
Correct answers: 114
The first user who solved this task is Roxana zavari.
#brainteasers #riddles
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Phil had just joined a club af...

Phil had just joined a club after his friend had recommended it (being a member for quite some time). They were sitting at the bar having their beers when someone yelled "21" and there was a small uproar of laughter. A few minutes later someone else yelled "34" and another roar of laughter rose up. Phil, confused about this asked his friend "Why is everyone laughing at the numbers being called out" His friend said, well we've been telling the same jokes for so many years that we just numbered them all and if you want to tell a joke you just call out a number" Phil nodded and said "Can I try?" His friend nodded and Phil called out "121" and everyone in the club roared with laughter and it didn't die down for at least another 15 minutes after. "Why did everyone laugh so hard at that joke?" Phil asked. His friend said with a small chuckle "We haven't heard that one before."
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Vitamin A

In 1947, the first full synthesis route for vitamin A was found by Dutch chemists, Jozef Ferdinand Arens and David Adriaan van Dorp. Later in 1947, a team headed by O. Isler also synthesized vitamin A using a method more suitable to produce commerical quantities. In 1913, Thomas B. Osborne and Lafayette Mendel had shown experimentally with rats that butter contained a factor responsible for growth development. Their work was confirmed (1913) by Elmer McCullum and Marguerite Davis who also identified a fat-soluble nutrient in butterfat and cod liver oil. It became known as vitamin A, and its chemical structure was determined in 1931 by Paul Karrer.«(Ref Arens and van Dorp, Synthesis of Vitamin A aldehyde, Nature 160: 187, 1947)
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