QWERTY Keyboard & The Entrenched Habits of Society
The reason the letters were placed as they were (rather than in alphabetical order like the early typewriters) was to solve a problem that existed at that time. Some people wound up typing so fast that the mechanical rods attached to the keys would stick to each other.
To resolve this, the QWERTY keyboard was developed. It placed keys in such a manner that the most used letters were spaced out so that the rods were less likely to clash into each other when typing. This keyboard layout became standard with the popularity of the Remington typewriter which was the first to use it, and all other manufacturers fell in line.
So here we are, more than 140 years later, using a keyboard layout designed to fix a problem that no longer exists.
http://gizmodo.com/why-we-still-use-qwerty-keyboards-even-though-theyre-a-1643855077
The only reason we're still tying our fingers in knots more than a century later is simply because QWERTY got here first. Since then, several more "scientifically" designed keyboard layouts have been introduced. ...And yet, QWERTY shows little sign of going anywhere, all because of the "first mover" advantage -- everybody has already grown up knowing only one way to type, and nobody wants to completely relearn how to type for the possibility of slightly increased speed and comfort, at least until they get carpal tunnel...
http://www.cracked.com/article_19151_5-bad-ideas-humanity-sticking-with-out-habit.html