He is facing many difficulties due to gender identity disorder.

He can speak many languages.

Do you know the etymology of this word?

He was arrested in flagrante delicto.

He is good at speaking the dialect of that region.

The Hogen era is a Japanese era name that lasted from 1156 to 1159.

The atomic clock shows a very accurate time.

Understanding the structure of the atomic nucleus is an important part of physics.

Pathogens can pose a significant threat to human health.

This pathogen is a new type of virus.