Replace the question mark with a number
[3093] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 796 - The first user who solved this task is Дејан Шкребић
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 796
The first user who solved this task is Дејан Шкребић.
#brainteasers #math #riddles
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After eight days of backpackin...

After eight days of backpacking with my wife, we were looking pretty scruffy. One morning she came to breakfast in a baseball cap, her shoulder length hair sticking out at odd angles.
"Darling," she said, "does my hair make me look like a water buffalo?"
I thought for a moment, then said, "If I tell you the truth, do you promise not to charge?"
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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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