Is there any restriction as to what languages are allowed in SE chat rooms? I have seen many people speak in German, Russian or French in the English Language & Usage chat room, but whenever I speak in Persian (to a friend who understands me), some people start nagging that I should only spea...

If I add an "s" to some plural words they revert to a singular form. For instance: adventures --> adventuress bras --> brass cares --> caress deadlines --> deadliness millionaires --> millionairess ogres --> ogress princes --> princess Is there an historical reason?

I'm not sure if this question is on topic (maybe it just needs to be rephrased), but since this made global headlines due to the Dalai Lama not being able to understand it, I figure most non-native speakers would have trouble getting the joke too. This is the joke on YouTube. The Dalai Lama ...

In the past — or at least, when I was in elementary school — periods/full stops were followed by two spaces. Lately, it's become more and more common to see just one space. In the modern world, should we still use two spaces between sentences, or is just one okay? Does it depend on...