Superfluidity is a part of physics, referring to the phenomenon where certain liquids flow without friction.

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.

He always proactively suggests new ideas.

He likes to take a walk in the park at dusk.

He is a realist who values reality more than dreams.

She is conducting research on the world's oldest profession.

Old World monkeys primarily inhabit Africa and Asia.

The World Trade Organization is an important organization that sets the rules for international trade.