Time

As the clocks go forward this spring, see if you can solve these puzzles based on ancient calendars.

Cause is usually followed by effect, but in the quantum world, time's sequencing is not so straightforward.

The pros and cons of daylight saving sparks debate around the world. Here's why some places have opted out.

The invention of railroads ushered in a new era of land travel, and forever changed the way humans perceive time.

When the clocks shift for daylight savings, it can disrupt everyone's sleep for a few days. For tired parents, it can be an extra worry.

Children's perception of time is relatively understudied. Learning to see time through their eyes may be fundamental to a happier human experience.

Billions of years ago the average Earth day lasted less than 13 hours and it is continuing to lengthen. The reason lies in our relationship to the Moon.

As Europe's clocks move forward, daylight hours extend into the evening. For one early proponent, this had a key advantage: more time to hang out with bugs.