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Find number abc

If 6c567 + 66577 = 1b51aa find number abc. Multiple solutions may exist.

Correct answers: 2

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Invisible man

Nurse: "The invisible man is here for his appointment."
Doctor: "Tell him I'm sorry I can't see him right now."

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Air Radar

In 1947, the first U.S. radar for commercial and private planes was first demonstrated at Culver City, California on a TWA airplane. In the cockpit, both a bright red panel light and a horn warned the pilot if the plane was not at a safe distance from obstacles to flight. The device was developed at the Hughes Aircraft Corp. by Howard Robard Hughes and a team of electronic engineers.

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