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D: Guess what? If you’re upside-down for too long blood comes out of your mouth.

Me: That’s not true – who told you that?

D: Misha told me it. So is he telling me lies?

Me: Well, he’s probably just mistaken. If you’re upside-down for a long time, blood will go to your head and your head will feel heavy. Then you’ll feel a bit dizzy when you’re the right way round again, but blood won’t come out of your mouth.

D: And then when you stand the right way round again, the blood will go back down to your feet?

Me: Yes, and you heart will help to keep it pumping around your body.

D: Oh yes – your heart has two halves and one half pumps the blood out through a tube.

Me: Did you remember that from your Human Body book?

D: No, I just knew it.