ThingOne asked me about university this evening as she and ThingTwo ate tea. I explained that it's somewhere you go when you're 18 if you want to continue studying, and you can choose what you want to learn.
ThingOne: "I want to learn about the elements."
Me: "Well, that's Chemistry. Mummy did some of that. She did Biochemistry and Genetics. Genetics is about DNA."
ThingOne: "That's what I want to do. Biochemistry and Genetics."
ThingTwo: "What's easiest?"