Today is National Dinosaur Day, a chance to celebrate the giant creatures that once ruled the Earth and test just how much prehistoric knowledge you've got tucked away in your brain. A recent poll of more than 1,000 adults found that not everyone is a dinosaur expert. Nine per cent of respondents admitted they couldn't name a single dinosaur off the top of their head, while only seven per cent said they could name 10 or more. Of course, most people can probably rattle off the classics like Tyran