Many people now use activity trackers to monitor their daily steps and sleep.

Organizing a neighborhood clean-up as a civic activity brought residents together to improve their community.

During finals week, the library and campus café turned into beehives of activity, with students studying in every corner and friends exchanging notes at long tables.

I checked the activity stream to see who had commented on my post.

During the interrogation, his constant tapping and throat-clearing seemed like a displacement activity that masked his uncertainty.

Developers analyzed the activity streams to identify patterns in user behavior.

Researchers observed a surprising amount of dark-activity among the coastal shorebirds during the summer months.

The teacher brought several activity books to keep the students engaged during the rainy afternoon.

She brought an activity book to keep her younger cousin entertained during the long train ride.

Raman optical activity provides insight into the absolute configuration of chiral molecules by comparing the intensities of left and right circularly polarized Raman scattering.