I scooped and drank the soup with a spoon.

On cold days, a heater is necessary.

Hydrocarbons are fundamental components of organic chemistry.

Lithium hydride plays an important role in chemical reactions.

Hydrogen peroxide is often used for disinfecting wounds.

He is a world-renowned bacteriologist.

He is traveling around the world as an ecologist.

He is a world-famous archaeologist.

He is a famous philosopher.

Aristotle was a famous philosopher in ancient Greece.