I’m getting used to the idea that our concepts of the nature of our universe tend to change as we dig for answers. My mind isn’t accustomed to grasping these concepts, but I keep trying. In a way, the idea that particles and space are not fundamental actually makes more sense than the idea that there is such a thing as fundamental.

I like the idea of comparing decision-making among different age groups.

The scientific method is important, but cosmic theories will always take time to prove or disprove. The more theories the better, and the more experimental physicists out there working on them the better.

I find that Elizabeth’s answer is sufficient to answer this.

The answer from Abdulrahman Alhamali is very interesting and I like it.

Bart crosses over. He sees that from his perspective, and observers at the cover may see it differently, but they can calculate how his measurement given the different time clocks on the front and rear of his skate board, would allow him to cross.

It’s good for me too, Roger. Encountering all this for the first time, I really can’t say how the concepts would sit with me if introduced differently, however.

So far, this course, although challenging given it’s been 40 years since I was in college, has worked for me.