Objectivism has its merits (pardon the pun). Mrs. Rand's absolute distain for altruism comes from her brush with near death by Socialism/Communism in her youth. Her altruistic neighbors and friends just got rolled over by people with a greater desire for crushing power.
On the actual tractor problem, how can you see anything THROUGH that fogged up sight glass?
On the actual tractor problem, how can you see anything THROUGH that fogged up sight glass?