GPS. I know how it works in principle* - but it’s still magic that I can be in the most remote spot in the world and still get my exact bearings to the nearest square metre.

( * Triangulate from the time offsets in ping messages from four or more satellites with synchronised clocks, right?)

I found my way in via Lions Led By Donkeys and now I’m addicted to WTYP and KJB. What a collection of lunatics.

I think you’ll find he’s a cancer specialist, actually.

Nicely done. Took me a minute