46 Eating car tyres

We are getting quite into rocks in our reading. Magic School bus goes to the centre of the earth, Why do caves have stalactites? - that sort of thing.

And when we were reading about caves the other day we came to a section on Bird's Nest Soup. So I read about how the tiny birds weave the nests using their own spittle, and then I said to the girls,
"And guess what? People in China like to eat the nests in soup!"
"Eeeuuww," they said. I think this sounded even worse than having to eat vegetables.
"Mmm, well, people in China like to eat all sorts of strange things that we wouldn't like to eat," I continued.
"Do they like to eat car tyres?" asked one of my daughters.