Replace the question mark with a number
[2563] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 638 - The first user who solved this task is Donya Sayah30
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 638
The first user who solved this task is Donya Sayah30.
#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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Donald B. Keck

Born 2 Jan 1941.American research physicist, who with his colleagues at Corning Glass, Dr. Robert Maurer and Dr. Peter Schultz, invented fused silica optical waveguide - optical fiber. This was a breakthrough creating a revolution in telecommunications, capable of carrying 65,000 times more information than conventional copper wire. In 1970, Maurer, Keck, and Schultz solved a problem that had previously stumped scientists around the world. They designed and produced the first optical fiber with optical losses low enough for wide use in telecommunications. The light loss was limited to 20 decibels per kilometer (at least one percent of the light entering a fiber remains after traveling one kilometer).
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