What is hidden in 3D image?
[4073] What is hidden in 3D image? - Stereogram - 3D Image - #brainteasers #stereogram #3Dimage
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What is hidden in 3D image?

Stereogram - 3D Image
#brainteasers #stereogram #3Dimage
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Passport

An old lady had always wanted to travel abroad. Now that she was getting on in years, she thought she would really like to do so before she died.

Until now, she'd never even been out of the country. So she began by going in person to the Passport Office and asking how long it would take to have one issued.

"You must take the loyalty oath first," responded the passport clerk. "Raise your right hand, please. "The old gal raised her right hand.

"Do you swear to defend the Constitution of the United States against all its enemies, domestic or foreign?" was the first question.

The little old lady's face paled and her voice trembled as she asked in a small voice, "Uhhh . . . all by myself?"

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Vacuum tube

In 1906, Dr. Lee DeForest (26 Aug 1873 - 30 Jun 1961), one of the “fathers of radio,'' announced his three-element electrical vacuum tube (now known as a triode) to a meeting of the American Institute of Electrical Engineers He had discovered that when a mesh, or grid, of wire was placed between the filament and collector “plate” in a diode tube (first made by J. Ambrose Fleming, 1904), a large voltage-amplifying effect could be produced. DeForest patented this vacuum tube on 15 Jan 1907. The ability of this tube to amplifiy weak signals was an invention as great as radio itself, because it made long-distance communication possible.[Image: early DeForest Audion]
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