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More people should build stuff with vacuum tubes. They’re easier to understand on a conceptual level than semiconductors, and it’s absolutely worth learning the limitations of things from the past at a fundamental level, plus there are still millions of them in circulation

It’s always a good time to learn about spiral antennas

Similarly, it was much easier to get my ham license than I thought it was, more people should do it! But be careful about sharing your call sign unless you’ve registered with a PO Box, because the FCC database is fully public, including your address and phone number

I learned on vacuum tubes first, and yes, they're easier than transistors, but these days I'm much happier working at 3.3-5V than 110V :-)