@Alice So, I was a high school science teacher. A fair number of students expected me to be an expert on all areas of science. I had to sort answers into six types:

1. I know that, here’s an easy answer

2. a) I know that, there’s a far deeper interpretation of that, here’s a learner-appropriate answer

2. b) After pushback on (a): “All models are wrong, some are useful” -George Box

3. I’m not sure, here’s a plausible answer and my percentage confidence that it’s right (I loved those answers)

4. No clue, lemme get back to you

5. No one knows, scientists love your question

6. We’ll probably never know, ask God when you see him 😉