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Rolf Engel
(10 Aug 1912 - 23 Nov 1993)
German rocket engineer who joined those, including Wernher von Braun, who formed a rocket society in 1928. By 20 Feb 1931, he launched the HW-1 rocket, the first launching of a German liquid propellant rocket.
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Science Quotes by Rolf Engel (1 quote)
[Werhner von Braun] is a human leader whose eyes and thoughts have always been turned toward the stars. It would be foolish to assign rocketry success to one person totally. Components must necessarily be the work of many minds; so must successive stages of development. But because Wernher von Braun joins technical ability, passionate optimism, immense experience and uncanny organizing ability in the elusive power to create a team, he is the greatest human element behind today’s rocketry success
— Rolf Engel
Quoted in 'Reach For The Stars', Time (17 Feb 1958), 71, 25.

In science it often happens that scientists say, 'You know that's a really good argument; my position is mistaken,' and then they would actually change their minds and you never hear that old view from them again. They really do it. It doesn't happen as often as it should, because scientists are human and change is sometimes painful. But it happens every day. I cannot recall the last time something like that happened in politics or religion.
(1987) --
Carl Sagan
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