Once upon a time... Sounds like a simple enough way to start a story - and particularly a story about time travel, but what does it mean, 'once upon a time'? What is time? Clocks can tell us what time it is, but they cannot tell us what time is The story of time travel you are about to read, while a work of fiction, is largely based on real science, real people and real events. Where fact leaves off and fiction begins is for you to decide. Do a search on just about anything in this book and make up your own mind what is 'real'. For instance Morgan Robertson really did publish a book on the...