Calculate product...
[1731] Calculate product... - Calculate product of four consecutive prime numbers with the sum of 220. - #brainteasers #math - Correct Answers: 53 - The first user who solved this task is Sanja Šabović
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Calculate product...

Calculate product of four consecutive prime numbers with the sum of 220.
Correct answers: 53
The first user who solved this task is Sanja Šabović.
#brainteasers #math
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Late one night a mugger wearin...

Late one night a mugger wearing a ski mask jumped into a path of a well-dressed man and stuck a gun in his ribs "give me your money," he demanded. Indignant, the affluent man replied, "you can't do this – I am a United States congressman!" "In that case," replied the mugger, "give me MY money."
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Edison patent

In 1907, Thomas A. Edison was issued a patent for a "Diaphragm for Talking-Machines" (U.S. No. 855,562) that "will be readily responsive to vibrations of comparatively great amplitude." The invention comprised a duplex diaphragm made of at least two disks, each of which is radially sloted so that each disk constitutes a series of reeds. By staggering the slots of the disks, a continuous surface is presented for actuating the sound waves. The disks, made of mica about one-thousandth of an inch thick, are cemented together with an elastic cement, such as a solution of gum rubber.
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