I’ve seen a lot of rulers that actually don’t have a mark at 0 and instead go right to the edge as 0. Typically they are worn down, being made of wood, so the accuracy of the first inch is dubious. To ensure the distance is correct, sliding the ruler down one unit is a good idea. So, my ruler starts at 0 but my measurements start at 1.
I’m listening to the Bobiverse again because the fifth book came out recently. The universe, pun intended, was really interesting and the entire idea of digital people is fun to think about while doing chores.