Global warming is a big issue that affects all of us.

He believes in the geocentric theory.

A terrestrial planet may have an environment similar to Earth.

He is spending a lot of time on experimental research.

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.

My father is an expert in otolaryngology.

He is majoring in linguistics.

He has a deep interest in astronomy.