Calculate the number 4288
[7650] Calculate the number 4288 - NUMBERMANIA: Calculate the number 4288 using numbers [1, 4, 3, 1, 61, 846] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 1
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Calculate the number 4288

NUMBERMANIA: Calculate the number 4288 using numbers [1, 4, 3, 1, 61, 846] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
#brainteasers #math #numbermania
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The interested doctor

A concerned woman phones a doctor and says, "Doctor, I'm worried about my husband. He thinks he's a dog!"

"I'm coming over right away," the doctor says.

When the doctor arrives, the woman opens the door, and her husband, on all four, starts wagging his bottom and licking the doctor's hand.

"Interesting", the doctor says, startled. "I'll examine him. Make him lie down on the sofa."

"Doctor", the woman says, "I can't! He's not allowed the sofa!"

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Ultrasonic alarm

In 1953, the first U.S. patent for a burglar alarm operated by ultrasonic sound was issued to Samuel Bagno of New York City (No. 2,655,645) on a system for movement detection in a confined space by intruders or fire. It was manufactured as the Alertronic and first sold in Jun 1950. A sound source produced waves of 19,000 hertz, a frequency too high for normal human hearing. An intruder could be detected by the alarm by a difference in frequency of the reflected waves from the moving body (the Doppler effect). The device would then sound an alarm.
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