Spacetime tells matter how to move; matter tells spacetime how to curve.
We will first understand how simple the universe is when we recognize how strange it is.
One can only learn by teaching.
We live on an island surrounded by a sea of ignorance. As our island of knowledge grows, so does the shore of our ignorance.
The observer cannot be left out of the description of the observation.
This is *our* Universe, our museum of wonder and beauty, our cathedral.