Don McLean

Herman Melville was supposed to be an accountant. Van Gogh was meant to be an art dealer. I was meant to take the train into New York and work for a bank. To be an artist, you have to say goodbye to your family.

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.

Running fills the cup that has to pour out for others. Running feeds the soul that has a responsibility to nourish. Running sets the anchor that limits the drift of the day. Running clears the mind that has a myriad of challenges to solve. Running tends to the self so that selfishness can subside.