The Med is far less salty than the Dead Sea. The Dead Sea is one of the saltiest bodies of water in the world. Maybe that’s what was throwing you off.
I do read some on sciences that interest me, but not having a proper background puts one at a distinct disadvantage. I did study some chemistry and physics but am still too lacking in knowledge and understanding about some very basic things.
I did "float" in the Great Salt Lake. An odd but fascinating experience. It's not a place you'd really want to swim unless you had to.