But, since Jamie has been able to talk, I've discovered I know even less about "things" than I feared.
Take this morning's gem, as I walked him and pushed Charlotte to nursery.
"Daddy?"
"Yes, Jamie?"
"What are smells made of?"
I do genuinely remember this subject being raised at school, in either biology or chemistry, and according to my recollection, the teacher didn't know either.
"Opinions differ," was something like the answer he gave. Since then, no-one has bothered to update me.
However, be assured that I am now on the case and will obviously report back to you - and Jamie - with my conclusions in due course.