What is hidden in 3D image?

Stereogram - 3D Image

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We Are The Best Of Friends

The patient shook his doctor's hand in gratitude and said, "Since we are the best of friends, I would not want to insult you by offering payment. But I would like for you to know that I had mentioned you in my will."
"That is very kind of you," said the doctor emotionally, and then added, "Can I see that prescription I just gave you? I'd like to make a little change."

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Helicopter

In 1922, Henry A. Berliner demonstrated the first helicopter prototype for representatives of the U.S. Bureau of Aeronautics in College Park, Maryland. Berliner made this first ever controlled horizontal helicopter flight in a war-surplus Nieuport 23 fighter with tilting tail rotor, and a short-span upper wing with 14-ft helicopter blades at the tips. It was powered with a Bentley 220 hp engine to the front which turned the two counter-rotating lifting rotors through a series of geared shafts. The two rotors could tilt slightly in opposite directions to control yaw. Two sets of five 36-in x 8-in louvers, located below each rotor, opened and closed differentially to provide roll control by presenting a flat surface, which reacted against the rotor downwash.

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