Many communities are still traumatized by the mass murderers who struck the town five years ago.

During the consecration, the sacristan gently rang the Mass bell to signal the mystery of the Eucharist.

The research team compared the sensitivity of two mass spectrographs to detect trace organic contaminants in seawater.

The chemist carefully calibrated the mass spectrograph before running the sample to ensure accurate isotope measurements.

The technician examined the mass spectrum to identify the unknown compound.

Every last Friday of the month, our city organizes a Critical Mass that winds through downtown to promote cycling safety.

After the fuel price spike, more people started using mass transit to commute to work.

After the earthquake, the village held a solemn mass funeral to perform the necessary burial rites for the many victims.

The committee studied several mass murders to identify patterns and recommend policy changes.

The community struggled to come to terms with the fact that the mass murderer had lived quietly among them for years.