Just away from Nature itself, a few other places which give you the ability to go to sources directly if you want to research something for yourself.
JSTOR offers limited access to papers with a free account, for those without access to a decent library. It's only 3 articles every fortnight however. But better than a kick to the nether regions and it covers a crazy amount of academic journals.
Plosone is becoming very fashionable to use. Open access, peer reviewed papers. The homo naledi papers were put up there, which caused quite a stir as usually one would expect it to take a few years from discovery to publication in a traditional journal.
Academia.edu has a huge number of essays and articles put up by individual academics wanting to do open access. You may want to just create an account (free) to be able to browse through. Much goodness contained whether you're into science things or the humanities.