What number comes next?
[249] What number comes next? - Look at the series (2, 3, 6, 21, 231), determine the pattern, and find the value of the next number! - #brainteasers #math - Correct Answers: 56 - The first user who solved this task is Slobodan Strelac
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What number comes next?

Look at the series (2, 3, 6, 21, 231), determine the pattern, and find the value of the next number!
Correct answers: 56
The first user who solved this task is Slobodan Strelac.
#brainteasers #math
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What Commandment?

A man was upset because he had lost his favorite hat. Instead of buying a new one, he decided that he would go to church that Sunday and steal one from the vestibule.

Unfortunately, the usher saw the man come in and before he could go into the vestibule, the usher led him to a pew, where the preacher was just beginning a sermon on the Ten Commandments.

After church, the man went up to the preacher and, shook his hand and said: "I want to thank you for saving my soul today. I came to church to steal a hat, but after hearing your sermon on the Ten Commandments, I changed my mind."

"Why, that's wonderful," the preacher said: "So the commandment 'Thou shalt not steal' changed your mind, did it?"

"No, it wasn't that commandment," the man said: "It was the one about adultery. It reminded me where I left my hat!"

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Achromatic lenses

In 1758, optician John Dolland, having created achromatic lenses, reported this to the Royal Society. Isaac Newton had described the blurring effect due to chromatic abberation, but could not solve the problem in simple lenses, which was important in the preparation of lenses for telescopes and microscopes. A concave face of a lens of flint glass (which has a greater color dispersion than crown glass) is cemented to a convex face of a crown glass lens. Thus the dispersion properties causing chromatic aberration are removed from both lenses simultaneously. Although Dollond patented the discovery of the achromatic lens in the mid-18th century, it is widely believed that he was not its inventor, but learned about it from lens maker George Bass.
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