I often go birdwatching in the park on weekends.

Everyone was on guard because of his suspicious behavior.

Everyone was on guard because of his suspicious behavior.

He committed another crime while on probation.

Beta particles have the same charge as electrons.

A boson is an important concept in physics.

An antiparticle is a particle that pairs with a matter particle.

Charged particles are affected by electric fields.

An alpha particle is the same as the nucleus of a helium atom.

The tau particle is a part of particle physics.