I've always had to train harder than others to get the oxygen to my muscles because of my lung capacity. I have to push myself past the point of being comfortable.
My dad was in a wheelchair and on oxygen for the last few years of his life.
My own fear, if I have one myself, is a fear of being obsolete. This is a world that changes very fast, and one of the main human desires is to belong to, to be part of, something. It's probably one of our greatest needs next to oxygen.
I am not a Ph.D. in economics or a doctorate in literature that I can afford to take my singing lightly. Even if I sing a jingle, I take it as seriously as oxygen.
With sufficient water on the Moon, solar energy can be used to split the water into hydrogen and oxygen. The oxygen is, of course, critical for humans to breathe and the water important for us to drink.
An adult human can last 40 days without food, a week without any sleep, three days without water, but only five minutes without air. Yet nothing is more taken for granted than the air we breathe. However, not just any air will do - it must be exquisitely designed to meet our needs. Too little oxygen in the atmosphere will kill us, as will too much.
