Priestley is my best friend.

This apartment has an automatic locking system.

He is known as an eccentric artist.

His eccentric behavior sometimes confuses people.

A femtometer is a unit of length, equal to 10 to the negative 15th power of a meter.

The top quark is the heaviest quark in particle physics.

This bacterium is about 1 micrometre in size.

It's 5 kilometers from my house to school.

Strontium is one of the elements abundantly present in the earth's crust.

He loves extreme sports.