Time travel is banned in China
Chinese censorship can be capricious. Sometimes Wikipedia's blocked, sometimes just certain articles are blocked. Today I can reach the Tiananmen Square Protests 1989 page no problem.
If I do a Google search, half the time it gets routed through Google.com.hk and works fine; the other half of the time I land on some super-sketchy-looking site at http://sh.114so.cn.
Blogger and Wordpress are both blocked, Tumblr gets sporadically blocked or redirected, but amusingly 4chan works fine.
At least I can understand the government's reasons for blocking political content and sites that people use to organize protests. Some of the other things they choose to censor are truly baffling -- like time travel! China has recently banned all movies and TV shows that use time travel as a plot device.
Additionally, you're not allowed to show human skeletons. (They had to redo a lot of artwork for the Chinese version of World of Warcraft.)
I just had the best idea for the ultimate "banned in China" movie: It's about a time-traveling Tibetan skeleton who goes back in time to Tiananmen Square 1989 in order to overthrow the government using secret Falun Gong techniques.