I have observed fluid dynamics for a while now, I still consider it fascinating, and this is why I use every opportunity to study it more. I have frequent opportunities to get close to water:
- after I eat and my face is a total (or partial) mess.
- when I take a bath.
- when I (ahem, excuse my french) poop. In these circumstances one of my parents washes my behind (and sometimes both of them get involved in this laborious task).
A set of basic fluid dynamics experiments is illustrated below. Since my face is clean and I am not getting ready for a bath, guess what’s in my diaper? If you are like “Ew, gross”, just don’t think about it while you look at the pictures.