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.

So, which dots are black?

Would you believe that areas A and B are the same color?
If no, click here.

How many people do you see? And now?

Try concentrating on a dot in the middle and move your head forward and backwards...