Excellent post and I learned a lot. One tiny quibble is that it is the left side pedal on a bicycle that is "reverse threaded". And as an exercise to the reade

Excellent post and I learned a lot. One tiny quibble is that it is the left side pedal on a bicycle that is "reverse threaded". And as an exercise to the reader, if you think carefully through relative rotations of each pedal compared to its shaft, shouldn't it be the right side pedal that goes on/off wrong!? Why on earth is it the left one? answer here: https://blog.everydayscientist.com/?p=2655 https://blog.everydayscientist.com/?p=2655