Everything I know about the general theory of relativity, everything I know about thought experiments, most of what I know about questions in general, really, comes from the Uncle Albert books. I used to have Ask Uncle Albert: 100 1/2 tricky science questions answered, but I don’t know where it’s gone. Which is a pity, because it would have worked very well for this prompt, and, in fact, this whole series.
Kathleen Jowitt 