Chart: More and more academic articles are becoming free for everyone - Vox

"Academic researchers generally want their papers to be read by as many people as possible. But the journals that publish those papers are, in many cases, for-profit institutions — and they prefer charging for access. Lately, however, the Open Access movement has been fighting to make more and more research free to the public. And they're succeeding. Here's a snapshot of what was freely available to the public in 2010, sorted by discipline ..."