Colorblind Facts

Facebook is blue because Mark Zuckerberg is red-green color blind. Blue is the only color he can see clearly. "Blue is the richest color for me — I can see all of blue," he told The New Yorker in 2010. One man's biology dictated the look of a platform used by 3 billion people.

Bulls are colorblind, therefore will usually charge at a matador's waving cape no matter what color it is -- be it red or neon yellow!

Special glasses exist that can enhance color perception for some people with red-green color blindness, allowing them to distinguish colors they couldn't before—though the effect varies by individual and doesn't fully replicate normal vision.