4 ms·
I remember being punished as a child and having to erase the things, then "clean" the erasers by pounding them together . . . surely a recipe for silicosis! ;-)
by drewcoo 3y ago
I remember being punished as a child and having to erase the things, then "clean" the erasers by pounding them together . . . surely a recipe for silicosis! ;-)
The point is that cleaning the blackboard and the erasers wasn't "all you can eat cake." It was messy (hard one to explain to the parents!), sneezy drudgery.
- MatthiasWandel 3y agochalk isn't a silicate. It's calcium carbonate. So no worries about silicosis. I think otherwise it would have been banned from schools long ago.