@rotopenguin I've *never* heard of these! Thanks
Interesting to see the wide variety of coherers.

@eniko @Njord That is neat - reminds me of those old TV remotes that were basically ultrasonic xylophones*
Any downside? I discovered a little while ago that my barbecue lighter (standard thing with the piezoelectic crystal) knocked out my computer’s multiport hub if it was used too near.

* https://www.reddit.com/r/Historycord/comments/1rv82y1/the_zenith_space_commander_1950s60s_one_of_the/

@minouette “The only way to probe deep into the core is to employ massive earthquakes” has serious James-Bond-villain energy