Stop in for a cup of coffee

When I was a kid going to school down in @Mopar Tim 's neighborhood we had a visitor in class from the Scripps Oceanographic Institute. Along with his visit he brought a tank full of the "air" they breathe in the submersible the institute has. I forget most of the chemical make up of it, no nitrogen at all in it and much of the other gases in the air we breathe is replaced by helium. We all got to try it, it was like listening to Saturday morning cartoons in the class room :lol: .