Children, questions and the enduring fascination of poo

I have two small grandsons staying, and oh, the questions. They range from "is mustard a liquid?" (I don't know) to "if Neil Armstrong wanted to do a poo on the moon, did he have to pull down his space suit and do it in a crater?" (almost certainly not).

What is it with small children and poo? Four children and seven grandchildren on, and I think I've had enough poo jokes to last me well into eternity. I eventually said, "they ought to have a museum of poo, and leave you two in it for a few days. That should put an end to all this fascination". They laughed so much, I wished I'd never said it.

Ah well. They go home tomorrow. I shall miss them terribly.