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 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.

We are planning to go to the science museum this weekend.

He is an expert in paleoanthropology, studying the lives of ancient humans.