I was looking at some trees today. Not how I usually spend my day, but I went to the park to see if I could find a shady spot in the hot weather. That of course got me thinking about trees, and how many there are, and just how much oxygen we have here on Earth. Seriously, that stuff is everywhere. We have so much oxygen in supply that we actually have places that offer oxygen therapy in Melbourne. That is, you can go along and receive various medical benefits from being in a hyperbaric chamber. I have quite a bit of experience in dealing with that sort of thing, of course, given that oxygen was of great importance on[…]