What is this material made of?

He loves science classes.

The air in this area is greatly affected by pollutants emitted from factories.

The existence of dark matter has not yet been fully proven.

Antibiotics don't work for colds, so please don't take them unnecessarily.

It is said that antimatter has properties opposite to those of matter.

We exist as a part of the material world.

I am very interested in social science.

His nature is very kind.

Detailed information is needed to understand the nature of that project.