I'm noticing this more and more in news stories. I guess their spell check doesn't work. Or the authors don't know the difference.
Or like in my case, keys sticking on my 9 y.o. computer. So if you see typos from me, pls. be gentle.
p.s. I've tried the canned air spray with no luck, and am too damned cheap too buy a new one, since this one otherwise works fine