Whenever I switch lines, Etorre's observation proves true: the other line always moves faster.

Ettore's observation that the other line always seems to speed up the moment you join yours left everyone in the bakery laughing and checking queues more nervously than usual.

The report highlighted several observational errors that affected the study's conclusions.

After reviewing the data, the scientist identified an observational error that explained the discrepancy between the expected and measured values.

As a participant-observer, she carefully recorded the daily routines of the community without disrupting them.

Every week, our family tries to observe the Sabbath by avoiding work and spending time together.

We watched the sunset from the observation deck as the city lights began to twinkle.

From the observation post on the ridge, the ranger could spot fires on the horizon before they spread.

Scientists debated whether multiple observable universes could leave detectable imprints on the cosmic microwave background.

The rangers set up several observation posts along the ridge to monitor the valley.