I didn't bookmark it, but one of the more interesting ones I've found was on how to teach high school physics to girls using home sewing machines. It had several experiments and projects listed. Must have been 1920s vintage, maybe 1930s. I thought it was interesting because of the sewing machines, the social/gender education, and the science involved. I think I stumbled across it looking for how many stitches were formed when using a handcrank 1 turn.