He is involved in the development of androids.

Nuclear fission is a powerful phenomenon that generates energy.

I am planning to go to Copenhagen next week.

Polytetrafluoroethylene is a very slippery material.

Alexandroupoli is a beautiful city in Greece.

He is a famous composer.

Apostrophes are often used in English spelling.

He kept a poker face and did not show his emotions.

My friend is working in the United Arab Emirates.

The Federal Republic of Yugoslavia was once an existing nation.