65 out of the 100 most cited papers are paywalled - Josh Nicholson & Alberto Pepe
The web was built specifically to share research papers amongst scientists. Despite this being the first goal of the modern web, most research is still published behind a paywall. (…) we systematically look at the top one hundred cited papers of all time and find that 65 of these papers are not open. Stated another way, the world’s most important research is inaccessible from the majority of the world.