When Joshua was about Niall’s age we were at the home of a chemist and professor of chemistry at Japan’s International University.  Between the host, Dave, and me was a candle that was burning.

Joshua looked at me and asked, “Dad, what’s in a candle?”

I replied, “Ask Dave.  He’ll know.”

Joshua looked at Dave who said, “Candles are made up of long-chain hydrocarbons.”

Joshua looked back at me and said, “Dave doesn’t know either!”