Provisional Cast-on- Used for infinity scarves for invisible join, or when you will be picking up stitches to work in opposite direction. Use only when pattern calls for it. Also can be used on a sweater, so you can add to length when finished.
Powers of Ten. An animation to help students visualize large numbers.Starts at 10 million light years from earth and moves toward earth and down to subatomic particles (electrons and protons) by successive orders of magnitude. Explains exponential notation