He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

Paleoecology is a field of study that investigates the relationship between past organisms and their environment.

Paleogeography is a study that researches the past geographical conditions of the Earth.

He is an expert in orthoepy, teaching pronunciation.

He is an expert in applied physics.

He is an expert in physical anthropology.

He is an expert in physical anthropology, conducting research on human evolution.

Gestalt psychology is an important means to understand human cognitive processes.

He is an expert in computational linguistics and is involved in the development of artificial intelligence.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.