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I have a single waving hand ...

I have a single waving hand I'm present in places across the land On fairer days, I depart I shorten with a broken heart. What am I?

Correct answers: 38

The first user who solved this task is Djordje Timotijevic.

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What is green and red and goes...

What is green and red and goes 100 miles an hour?
- A frog in a blender.

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Charles Stark Draper

Born 2 Oct 1901; died 25 Jul 1987 at age 85.American aeronautical engineer, educator, and science administrator who earned degrees from Stanford, Harvard, and MIT then, in 1939, became head of MIT's Instrumentation Laboratory, which was a centre for the design of navigational and guidance systems for ships, airplanes, and missiles from World War II through the Cold War. He developed gyroscope systems that stabilized and balanced gunsights and bombsights and which were later expanded to an inertial guidance system for launching long-range missiles at supersonic jet targets. He was "the father of inertial navigation." The Project Apollo contract for guiding man and spacecraft to the moon was also placed with the Instrumentation Lab.

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