Donald John Lewis, better known as D.J. Lewis, was an American mathematician specializing in number theory... (wikipedia)
When you come back, you have a new perspective on life. I now really appreciate heated buildings.
It absolutely proves that you can accomplish more than you think. We redefined our own lives and what can be accomplished.
It was extremely satisfying while we were doing it. But, that doesn't mean we had fun.
The intent of the trip was to prove what we could do at our age and we weren't going to give up.