A fascinating new book has revealed how punctuation and symbols have developed over thousands of years. Claire Cock-Starkey's new non-fiction Hyphens & Hashtags explores how punctuation such as full-stops, commas and exclamation marks have come to be part of our day-to-day writings. While the question mark is believed to come from Ancient Egypt, where they chose to use the shape of an inquisitive cat's tail, the hashtag has its origins ...