I am studying crystallography.

Glass is a type of transparent and hard material.

The lens of the eye helps filter light.

Calico cat is a type of cat with three different colors on its fur.

Intangible is an important part of cultural heritage.

The thing-in-itself cannot be understood through the senses.

The real estate company has standardized its business process.

The government proposed to institutionalize new regulations on traffic safety.

I bought some more gymnastics equipment for the gym room.

Artistic gymnastics is a very popular sport.