[Too]

Flying is low hanging fruit, i can explain the core concepts of how it works to a 8-year old child with a paper airplane in 10 minutes. Execution is still tricky but you know that it can eventually be done with enough effort, material and machinery. AI or crypto-currencies though, is har to explain even on a high level to my computer science educated friends.

I think the final chapter, Orders of Inovation, in the original post is on the right track. Today there are less of the first order inventions but there will be more and more of the third order inventions that build upon existing inventions.