The titles have been abridged for the sake of brevity, however the context remains the same. If your TIL is found on this list, it will be removed.
Starting your title with a why/what/who/where/how modifier should be unnecessary.
Please link directly to a reliable source that supports every claim in your post title. Submit interesting and specific facts that you just found out (not broad information you looked up, TodayILearned is not /r/wikipedia). You learn something new every day what did you learn today?