How many months during this ye...
[2811] How many months during this ye... - How many months during this year can have twenty eight days? - #brainteasers #riddles - Correct Answers: 141 - The first user who solved this task is Eugenio G. F. de Kereki
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How many months during this ye...

How many months during this year can have twenty eight days?
Correct answers: 141
The first user who solved this task is Eugenio G. F. de Kereki.
#brainteasers #riddles
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A man walks into a drugstore a...

A man walks into a drugstore and asks the pharmacist for a pack of condoms. Paying for them, he bursts into laughter and walks out of the store. The next day he comes in again, again buys condoms, and again walks out laughing.

Thinking this is somewhat strange, the pharmacist asks his assistant to follow the man if he comes back. Sure enough, the man comes in the next day and walks out laughing. This time the assistant goes after him, returning 20 minutes later.

"So did you follow him?" asks the pharmacist.

"Yup."

"Where did he go?"

"Your house."
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First use of chemical symbols in British textbook.

In 1832, Edward Turner wrote a Preface to the 4th edition of his textbook, Elements of Chemistry (published 1833), in which he explained his use of symbols to represent reactants and products in a chemical reaction of Cyanogen, because he found they solved the difficulty of giving a “clear and concise description of. the phenomena in ordinary language.” His was the first use of chemical symbols in a British chemistry textbook. Turner used some algebra-type notation as suggested by William Whewell with parts of Jöns Jacob Berzelius's system, in which iron was represented by Fe (from Ferrum) and oxygen by O. Thus Fe + O represented one oxide of iron, and 2Fe + 3O represented another. Dots over the symbol indicated degree of oxidation, and an underline stood for two equivalents of a substance.«
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