He is majoring in hydrology at university.

Combinatorial mathematics is a branch of mathematics that studies the combinations of things.

I am majoring in phonetics at university.

I study classical language every day.

He is majoring in folkloristics at university.

He is an expert in tidology, studying the fluctuations of the sea's tides.

He is active as a researcher in futurology.

This chemotransmitter plays a crucial role in transmitting information between nerve cells.

He is an expert in nuclear physics.

He went to school with his new schoolbag.