How amazing is this?
It's not entirely true that this came from Caimbridge (see this article), but so long as you keep the first and last letter of a word the same, you can jumble up all of the other letters and your brain can still read it. This helps to explain: Why Typos Are So Hard to Catch.
[Tip: It's worth turning on text-to-speech in Word to help catch those pesky typos. Sometimes you can hear mistakes even if you can't see them. This doesn't work with homophones, though.]