"Aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it deosn't mttaer in waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the frist and lsat ltteer be at the rghit pclae. The rset can be a total mses and you can sitll raed it wouthit porbelm.Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe."
True? Sort of.
Obviously the phenomenon is true, because you just read that paragraph. But it didn't come from Cambridge - or from "an American university," or from any of the other places you might have seen this attributed to. It appears to be something of an urband legend, with a semi-factual basis. Read more about it here.