Who is the mysterious person i...
[3325] Who is the mysterious person i... - Who is the mysterious person in the picture? - #brainteasers #riddles - Correct Answers: 48 - The first user who solved this task is On On Lunarbasil
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Who is the mysterious person i...

Who is the mysterious person in the picture?
Correct answers: 48
The first user who solved this task is On On Lunarbasil.
#brainteasers #riddles
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A college student challenged a...

A college student challenged a senior citizen, saying it was impossible for their generation to understand his. “You grew up in a different world,” the student said. “Today we have television, jet planes, space travel, nuclear energy, computers…”
Taking advantage of a pause in the student’s litany, the geezer said, “You’re right. We didn’t have those things when we were young; so we invented them! What are you doing for the next generation??”
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Photophone

In 1882, the photophone was demonstrated by Alexander Graham Bell and Charles Sumner Tainter. In their device, a mirrored silver disc was made to vibrate by speech from a speaking tube. Light reflected off the disc was focused by a parabolic dish onto a selenium photocell. The variations in the reflected light were converted into electrical signals carried to headphones.
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