As I was going through and reading this PDF I found it helpful and informative. Take a look at it, maybe even find some places to sketchnote or pull some lesson ideas. I think that we have to approach 21st century learning in different ways. It isn't just about we as teachers knowing everything, instead it is about giving students tools and skills to find answers on their own. To me sketchnotes are a skill to give students to help them achieve more 21st century skills.