Answering Robb's question made me think of a very mild puzzler:

Can you think of a way to connect up an octal tube socket so that no
matter what orientation a pair of crystals is put into it you'll still
have two switchable crystals (no forcing pins allowed -- only schemes
where the crystal goes into receptacle 1 & 3, 2 & 4, etc.).

And, after you exercise the dozen brain cells that it takes to answer
that question -- did anyone do it in a production radio, or publish it in
a magazine, that you know of?

--
My liberal friends think I'm a conservative kook.
My conservative friends think I'm a liberal kook.
Why am I not happy that they have found common ground?

Tim Wescott, Communications, Control, Circuits & Software
http://www.wescottdesign.com