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Calculate the number 1748

NUMBERMANIA: Calculate the number 1748 using numbers [9, 2, 8, 2, 72, 505] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 27

The first user who solved this task is Sanja Šabović.

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I was wondering why the ball k...

I was wondering why the ball kept getting bigger and bigger, and then it hit me.

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Insect electrocutor

In 1910, the first U.S. patent for an "electric insect destroyer" was issued to William H. Frost of Spokane, Washington (No. 974,785). The invention used a number of electrically energized parallel wires such that a flying insect passing between them would complete the circuit by bridging the wires with its body and electrocute the insect. The patent describes using fine wire and tensioners to keep the parallel segments taut. The charge on the wires could be supplied using an induction coil and a battery. The form of the device could be as a flat frame, or as a cylindrical arrangement surrounding a light to attract the insects into the charged cage.

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