space exploration
Joshua Morris (opens on the publisher’s site)
joshuamorris.info
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Atmosphere-breathing propulsion would let a low satellite use the air dragging it down as propellant, so flying closer to Earth can stay practical.
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Ken Shirriff's teardown of a 1980 Spacelab core-memory module makes 128 KB of RAM feel extraordinary again—each bit a ferrite ring you can point at.