He is an expert in planetary science.

Humanities is an academic field that studies human culture and society.

He is an excellent doctor.

He is a famous author, and his works are loved by many readers.

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

My spouse is a doctor.

Cerebrospinal fluid plays an important role in protecting the brain and spinal cord.

That theory is unscientific and has no evidence at all.

He is an expert in computer science.

The Ministry of Education is responsible for Japan's educational policy.