A post from a more innocent time — but it’s easy to forget details like this, which were emphasised in the old days:
Although you don’t see it with your eyes, the sizes of the keys on the iPhone keyboard are changing all the time. That is, the software enlarges the “landing area” of certain keys, based on probability.
For example, supposed you type “tim.” Now, the iPhone knows that no word in the language begins timw or timr—and so, invisibly, it enlarges the “landing area” of the E key, which greatly diminishes your chances of making a typo on that last letter. Very cool.