It looks like some people are pretty serious about collecting metrocards. This one is going for $790.00 and this 7 Days OF 70s one went for $536.00. Huh.
Penny Black Metrocard
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Mars For The Rest of Us — a weekly-or-more deep dive on the technical side of Mars exploration: rocket propulsion, microbiology, mission architecture, and everything in between. Written by Maciej Ceglowski.
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