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."
The man again wondered what chainsaws had to do with the power of gasoline, but he did so anyway. Eight times he filled up the chainsaw with gasoline. At the end of the day he had finished.
He left without speaking to the chemist for he now understood the power of gasoline.