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Calculate the number 4380

NUMBERMANIA: Calculate the number 4380 using numbers [9, 6, 1, 4, 39, 746] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 13

The first user who solved this task is Djordje Timotijevic.

#brainteasers #math #numbermania

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I'm sick of vegans

I'm sick of vegans interrogating me about my eating habits.
It's like the Spinach Inquisition!

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Edison patents

In 1906, Thomas A. Edison was issued a series of U.S. patents, (Nos 821,622 - 821,627), respectively for a "Process of Cleaning Metallic Surfaces" in the form of long continuous strips to prepare for coating (ex. by electroplating); as for a "Storage-Battery-Filling Apparatus," which provided a means to indicate when the proper filling level of solution has been reached; a "Gas-Separator for Storage Batteries"; a "Process of Treating Alkaline Storage Batterie"; a "Process of Making Metallic Films or Flakes"; and a "Process of Making Metallic Flakes or Scales."

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