Oxygen, which is one of the chemical elements, is necessary for us to breathe.

This chemical reaction is very dangerous.

Fluoridation is a part of chemical reactions, a process where fluorine combines with other elements.

Fluorine is one of the chemical elements, and its symbol is F.

He chose another path.

Part of this movie is based on actual events.

This process takes time.

This project aims for the combination of science and art.

He combined two ideas to create a new project.

Hydrogen is the most abundant element in the universe.