As evidenced by the diagrams that make up the Tree of Knowledge System, I think it is valuable that we teach individuals broad frames to think about the Universe and our place in it. That was why I ...

“The cosmos is also within us, we're made of star-stuff. We are a way for the cosmos to know itself.” - Carl Sagan Compared to the Sun, how big is the Earth? What is a scale model and how does it help ...