If you have ever sat in a quiet room with a wall clock nearby, you have probably noticed the steady tick-tock rhythm. It is such a common sound that most people barely notice it, yet the reason behind ...

Sharon Ann Holgate reviews A Brief History of Timekeeping: the Science of Marking Time, from Stonehenge to Atomic Clocks by Chad Orzel Prehistoric clock At Stonehenge, the summer solstice is marked by ...