There are many great mysteries in the history of the world. How did the stones get to Stonehenge? What happened to the Amber Room? What happened to Lord Lucan? What is the riddle and the meaning of the Spinx? Who was Jack the Ripper?
You can add to that what color is this dress after a user posted a picture on Tumblr of a dress worn by the mother of a bride at a Scottish wedding because she was confused about the color of the dress.
The result was in Internet meltdown and the most famous blue dress since the one worn by Monica Lewinski. By Friday 28 million people had seen the dress. Chances are you have seen this already. Unless you have been living under a rock. The dress has even drawn in psychologists who have asked weighty questions such as if you see it as darker are you prone to depression.
The dress is blue and black apparently....really....