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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.

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I Got Arrested

I got arrested today for walking out of an art museum with a painting.
I’m just so confused because earlier when I asked the security if I could take a picture, they said “yes.”

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Micrometer screw guage patent

In 1890, Laroy Sunderland Starrett received a U.S. patent for his micrometer screw guage (No. 433,311), which is the form still familiar and indispensible to any machinist or person measuring small objects in a physics lab. Since 1881, he had worked to improve the micrometers then existing. His design had a vernier scale, a smaller head, a locking device and a small knob extending from the barrel to enable quick rotation while closing the initial gap to the inserted object being measured. By 1899, his micrometer was available in a one-inch size for $6.50, including a leather case. He took out many other patents for the tools he invented or improved, and established a substantial tool manufacturing business.«

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