Notes
(At left: the International Space Station, photographed by astronauts in an orbiting shuttle.)
These are notes to supplement your textbook with more content and/or more color pictures for certain topics.
Please think about whether you need these notes before you print them out! If every student prints out a copy of every set of notes, it will be a lot of wasted paper. You will probably have better notes in your notebooks, and you can just glance at my notes on screen to check that you've got everything.