Rosehip Mole asked, and Nib — askNib's tutor — drew the answer live at a whiteboard. This is the spoken transcript; enable JavaScript to watch it drawn.
Hi
Hi there! I'm your whiteboard teacher — ask me anything you're curious about, big or small, and I'll draw it out for you.
I'm ready whenever you are — pick a question and let's put it up on the board together.