Why there's a "b" in the word "doubt"

English is widely recognized as one of the world's most difficult languages, due in no small part to its deep, highly irregular orthography. Niggling quirks in pronunciation, freaky verb conjugations, and seemingly non-sensical spelling conventions can all make English downright bewildering, even to native speakers.… » 12/18/12 8:00am 12/18/12 8:00am