Historians often compare different time periods to understand social change.

Many museums have closed periods during renovations, so check the schedule before visiting.

On Fridays, a few students choose to enroll in zero periods to get ahead on credits.

Employees should be aware that different departments may have different notice periods.

Many people experience mood swings and cramps before and during their menstrual periods.

The conference schedule includes several question periods after each presentation.

Astronomers compared the sidereal periods of the two exoplanets to understand their orbital resonances.

Researchers compared the gestation periods of several mammal species to understand reproductive adaptations.

Managers should be cautious after project launches, as honeymoon periods can mask underlying issues.

Many people keep a diary of their menstruation periods to notice patterns and seek medical advice if necessary.