He publicly disclosed that he has a gender identity disorder.

Sputnik is the first artificial satellite.

Watching this exciting movie made me feel roused, as if my blood was welling and my flesh was stirring.

Einstein proposed the theory of relativity.

His actions always have a duality.

My younger brother caught the influenza.

This material has high corrosion resistance.

The prevention of venereal diseases is most important in safe sexual behavior.

Radioactive elements are produced in nature and scientific experiments.

He was diagnosed with bipolar disorder.