HARVEY MACKAY
A father and his young son were out walking one afternoon, when the boy asked how the electricity went through the wires stretched between the telephone poles. "I don't know," said the father. "I never knew much about electricity."
A few blocks later the boy asked what caused lightning and thunder.
"To tell you the truth," said the father, "I never exactly understood that myself."
The boy continued to ask questions through the walk, none of which the father could explain. Finally, as they were nearing home, the boy said, "Dad, I hope you don't mind me asking you so many questions."
"Of course not," replied the father. "How else are you going to learn?"
Sooner or later, of course, the boy will stop asking his father questions, and that will be unfortunate. Curiosity and the desire to learn should always be encouraged and nurtured.
It's quite possible that the son's curiosity piqued the father's interest in learning something new. Google might be a good place to start. It is never enough to be satisfied with "I don't know."