The 16-cell is one of the convex regular polytopes in four dimensions.

The 600-cell is one of the regular polytopes in four dimensions.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

The motto of this team is 'one for all, all for one'.

There is a proverb that says, 'Plan your day in the morning and your year on New Year's Day,' which means that you should plan your day in the morning and your year on New Year's Day.

This mutetrahedron has a very unusual shape.

When learning Japanese grammar, it is important to understand verbs of the upper monograde conjugation.

He is trying to understand the concept of Trinity in Christianity.

He feels it takes time to acquire new skills, but Rome wasn't built in a day.

He is the type of person who understands ten from hearing one.