The history of the British Empire occupies a particularly important part in world history.

Abstract algebra is a branch of mathematics that studies algebraic structures.

The Paleolithic is the first era of human history.

My grandfather was born in the 1900's.

Abstract algebra is a field of mathematics that studies algebraic structures in an abstract way.

I am studying Modern English.

The Cultural Revolution is a part of China's history.

Cell biology is the study of the structure and function of cells, which are the basic units of life.

Let's calculate so that all numbers become equal.

Every morning, I meditate to cleanse my mind.