In spite of its being one of the cornerstones of historical research, even the historical expert is - understandably - terrified by the complications involved in the calculation of dates.
Twenty years after Stephen Hawking's 9-million-copy selling A Brief History of Time, pioneering theoretical physicist Sean Carroll takes our investigation into the nature of time to the next level.
';Entertaining and engrossing' Sean Carroll Press the snooze button on your alarm once too often and you soon remember the importance of good timekeeping.