What is hidden in 3D image?

Stereogram - 3D Image

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Two friends were standing in a...

Two friends were standing in a bank when a pair of robbers entered. Not only did the thieves clean out the tills, but they walked around with bags and ordered everyone to throw their valuables in.
Just as the robbers got to the pair, one of the friends turned to the other and, passing him a bill, said, "By the way, Joe, here's that twenty bucks I owe you."

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First electron tube

In 1904, the first electron tube, a diode thermionic valve, was invented by John Ambrose Fleming. The valve consists of a carbon or tungsten filament lamp, to which is added a metal plate (insulated from the filament), and a connecting wire brought through the glass wall of the bulb to a third terminal outside. When battery current is applied to the filament making it incandescent, the space between the filament and the insulated plate will be found to conduct elecrons in only one direction. That means if the valve is connected in a circuit in with an oscillating current, its one-way conductivity will convert the oscillating current into a unidirectional current capable of actuating a telephone receiver. He notified Marconi in a 30 Nov 1904 letter.

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