"The earth had more oxygen in the past than it does now. Now you kids are going to be told in textbooks that the earth had no oxygen at the beginning, when life was evolving, called a "reducing atmosphere." That is baloney! [...] It could not have evolved with oxygen, or without oxygen! But, if you double the air pressure and increase oxygen, not only does your hemoglobin take on oxygen, like it's supposed to, your plasma will get oxygen saturated, which means you could run hundreds of miles, without getting tired! Adam and Eve didn't need a car. They could run to grandma's."