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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 943

The first user who solved this task is Fazil Hashim.

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At the doctor's office, Tom wa...

At the doctor's office, Tom was getting a check up. "I have good news and bad news," says the doctor. "The good news is you have 24 hours left to live." Tom replies, "That's the good news?!" Then the doctor says, "The bad news is I should have told you that yesterday."

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Pyrex patented

In 1919, Pyrex glass was issued a U.S. patent (No. 1,304,623). The inventors, Eugene C. Sullivan and William C. Taylor were company research chemists who assigned the patent to Corning Glass Works. Pyrex is the trademark for their sodium borosilicate glass. The original patent, filed on 24 Jun 1915, foresaw the applications including glass baking dishes and laboratory ware. The useful properties of this composition of glass were a low linear thermal expansivity, relatively high coefficient of thermal conductivity (internal heat transfer) and high stability (to resist chemical attack). The composition specified a high silica content of more than 70%. The patent included a discussion of the role of including in the composition certain porportions of alumina, boric acid, antimony and lithia.«

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