He was struggling to understand the concept of a hypercube.

America is one of the superpowers in the world.

In physics, ultrashort waves form a part of the electromagnetic spectrum.

Electromagnetic interaction is one of the fundamental forces used to explain the force between substances.

He is majoring in electrical engineering.

It's difficult to understand the principles of electrooptics.

Chemotransmitters play an important role in the transmission of information between nerve cells.

Cytogenetics is a science that studies the structure and function of chromosomes and genes.

There is an old legend in this village.

Nitrogen makes up about 78% of the Earth's atmosphere.