Adolf Eugen Fick

Another interesting one I would say is, uh, contact lenses, maybe not invented per se, but Leonardo da Vinci sketched concepts resembling contact lenses as early as 1508.

The first functional ones are still older than you would think, and they were made of glass, which sounds horrifying, uh, but they were made in 1888 by German ophthalmologist Adolf Fick.

I think most people believe, I've always believed, that the flushing toilet is a fairly recent invention, but according to you, it's much, much older.

Oh, yes.