Reading makes you cross-eyed

It's official: for some of the time while we read, we're actually reading cross-eyed. Astonishingly, each of our eyes can focus on a different letter of a word, and our brain makes up the whole picture. Sometimes both eyes focus on the same letter - but only for about half the time. For the rest of the time, each eye looks at a different letters. Previously scientists thought our brain was favouring the image from one eye over the other.
Here's the article.