The F-15 was born from the difficult lessons learned during the Vietnam War. In the late 1950s, Air Force planners were confident that the advent of powerful new radars and long-range air-to-air missiles... continue reading
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Sewers were one of the earliest and most impactful advents of public health in urban areas, and it’s exciting that we’re still finding new ways to use them to that end.
posted by eric3579 2 years ago • 50 views • 12:10- 1