I confess I suffer from a common desire to make the world a better place. There are grand macro ways of doing that, like changing government policies, but one way of making the world a better place is by sanding a hardwood floor.
Sanding floors is really not my “thing”. . . it’s cheaper to hire the guys in trucks who specialize . . . but I have a client who asks me to do it here and there . . . this floor was vintage white oak (I think) — hard as steel. Was an exhausting job but truly gratifying to see decades of gunk disappear.
Below, done, with 2 coats of polyurethane:
Will last another 100 years. I confess, I enjoy an unusual degree of job satisfaction.