Well said @lemouth, there are many things we as scientists can do for Steem. Personally I believe that immortalizing technical information on the blockchain where there's no censorship involved would result in the creation of a free library available for all internet users, which would in turn promote true justice and freedom of information and at the same time attract more and more investors in the Steem ecosystem.
Of course, as you rightly pointed out, engagement is essential. Caring for one another is what we all should do in all aspects of life anyway. I also strongly agree that tutorials and lectures in the form of blogs would serve the community's best interests.
Regarding your lecture notes, thanks for sharing this as I've missed out on many of those.
Ps. I think the 3rd link (The Higgs Boson) doesn't work.