Easy access to Wikipedia can't be taken for granted in China, where the online encyclopedia, including the Chinese language version, has often been blocked. Wikipedia will tell you (depending, perhaps, on your location) that the first block came in June 2004, on the 15th anniversary of the Tiananmen Square crackdown. Of course, Wikipedia is far from being the only site deemed off-limits in the mainland; the authoritarian Chinese government is notorious for censoring information. Wikipedia co-founder Jimmy Wales recently told TIME, "It's never the case that we should accept censorship."