I sent the firm an email, but wonder if anybody has seen ViewMaster reels made of plastic instead of cardboard?
Humidity and termites are not nice to cardboard, and it turns out these things are common in some parts of Africa which might benefit from having cheap tools for displaying images of geological features (and meteorological, etc) to children who don't have access to TV or travel. (The students would have to share, obviously.)
So: has anybody seen more durable reels than the ones I remember from childhood? Or from 25 years ago when I asked them for information as part of an outreach proposal for Fermilab. It never got off the ground.