I wonder if we need to include this section. This seems more advanced for a beginners course. I'll defer, but that's my preference.

Yeah you're probably right. It gave me an excuse to show the animation below, but it's probably a bit too much to cover at this level.

Agree. There could be a paragraph saying "and there is more… all the goodness of JavaScript can be called from Observable, for example Generators (with a link, and the fun lil' demo).

This starts with "If we wanted to use the same function inside of code . . . ". Don't you mean "If we wanted to use this same function inside of Markdown . . . "?

Yes! That's a typo. Thanks for the catch. Just fixed it up.