"I'm not sure if I posted about this, but ...
A few weeks ago, ds4 says to me, "Mommy, when I grow up I'm going to be a scientist working at the zoo. But first, I need to build a robot to assist me. That's why I need to bring this notebook and pencil. I need to start writing my ideas and hypotheses."

He is serious."

I had the almost identical conversation with my DS! Love it!