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mNovak
on Feb 10, 2020
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Ask HN: What’s the most important modern simple in...
A pencil tip touching a steel razor blade is famously a diode which can be used to build a "foxhole" radio [1].
[1]
https://en.wikipedia.org/wiki/Foxhole_radio
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[1] https://en.wikipedia.org/wiki/Foxhole_radio