Time

When an oil embargo rocked the US, the president's radical solution was to make citizens start their working days an hour earlier – even in the darkness of midwinter

Changing the clocks is linked to a plethora of health impacts – from heart attacks to car crashes.

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.