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Find number abc

If 393ac + 4904b = aa4ba find number abc. Multiple solutions may exist.

Correct answers: 7

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Who Needs A Parachute

You do not need a parachute to go skydiving...
You need a parachute to go skydiving twice.

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World's first rocket-propelled aircraft flight

In 1928, the world's first rocket-propelled aircraft flight was made over the Rhon Mountains, Germany. It was a tailless glider with two solid-fuel rockets, pioneered and developed by Alexander Martin Lippisch.

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