Just for kicks, we dug out the old projectors and slides from the 60’s and 70’s. Amazingly they worked! Some of the 20-somethings were fascinated.
The projectors worked, including the lamps and cabled remote control. The old rectangular and circular slide decks worked and had kept the slides protected for decades. The cardboard slide holders had not curled or delaminated. The slides themselves were still sharp, although perhaps a bit faded. The projection screen was still white, flat and the retracting mechanism worked.
I wonder if our photos and presentations today will last as long?