Sci-Hub is a website that provides free access to millions of research papers and books, without regard to copyright, by bypassing publishers' paywalls in various ways.
Sci-Hub was founded by Alexandra Elbakyan in 2011 in Kazakhstan in response to the high cost of research papers behind paywalls. The site is widely used in both developed and developing countries, serving over 200,000 requests per day as of February 2016.
Dr Sabine Hossenfelder
For what it’s worth, my advice to young scientists is embedded above. Choose a nascent field and seek the best mentors; I was fortunate, but your choice now is even richer. Lastly, for the not-so-young: Pressures from has-been counters, from those who mindlessly equate universities with businesses, and from bigots of all shades imperil the openness, inclusivity, and liberality that are essential to the flourishing of young minds. Resist.
—Philip England, University of Oxford, U.K.