Pulsars are rapidly spinning neutron stars, the collapsed cores of once massive stars that ended their lives as supernova explosions. In this book, Geoff McNama
Clear and accessible introduction to the concept of time examines measurement, historic timekeeping methods, uses of time information, role of time in science a
What is time? When did we first use it? Does it always work? How do animals tell time? A fun and fascinating look at time from the first calendars and clocks to