A fragment of tonight’s bedtime conversation:
Daughter: Where is Mommy?
Me: Mommy is at the hospital taking care of the sick people. Mommy is a doctor and knows how to help them.
Daughter: What do you know how to do?
Me (hesitating): Well, I can calculate quantum transition amplitudes, and I can solve Einstein’s equations in certain special geometries…
Daughter: I think you can do better things than that.