Don releases educational videos through YouTube and they've since killed annotations. Leo says that the annotation editor really didn't work all that well on the mobile platform, which people found annoying. Leo says that it's likely better to use the title utility in the editor to do what annotations used to. That's a much better option. But he won't be able to link to them. He could always put links in the descriptions, though. Or he can even use a plain old white board. Don should check out Vi Hart on YouTube and see the trope she uses to explain her subject. Think about what's going to help the audience get the message the easiest.