Even though professional writers write articles of newspapers, magazines and books, and also professional editors and/or proof readers check them, usually one or two wrong characters, misspelled words can be found. Most of the mistakes are typos though.
The other day, I just happened to find a mistake in a newspaper. It was written that “atmospheric pressure is thin”. The correct way of saying it is “atmospheric pressure is low”. It was a mistake of how to use a proper word. For this kind of mistake, if the person wrote this never realizes that it is wrong, she or he will keep making the same mistake. As a result, this kind of mistake might be more problematic than typos.
I better be careful when I write something.