A man drove to the country seeking to understand the power of gasoline. He asked the chemist, "what is the power of gasoline?"
The chemist told him, "pick up this machete and clear an acre of land."
The man wondered what clearing land with a machete had to do with gasoline but did so anyway. Every day for thirty days he ate breakfast and cleared trees with the machete. At the end of thirty days he again asked the chemist "what is the power of gasoline?"
The chemist told him, "pick up this chainsaw and clear an acre of land."