If you watch the New Year’s festivities from New York, you know that they mark midnight with the dropping of a big, gaudy ball. You might assume this was just an arbitrary gimmick, but it ...

We often use descriptions such as 'quarter past' and 'half past' to tell the time, but it's also good to be able to say exactly how many minutes past the hour or how many minutes to the hour it is.

The mechanisms biology has exploited to tell time provide insights not only into the function and importance of timing on different scales, but also into the relative limits and flexibility of ...