The special theory of relativity is a theory proposed by Einstein.

He is writing a thesis on the theory of general relativity.

Stoichiometry is a method for calculating the amount of substances in a chemical reaction.

His and her opinions ended up in a six of one, half a dozen of the other argument.

He is known as a conspiracy theorist.

Pragmatics is a part of linguistics that considers not only the meaning of sentences but also their usage situations.

He is writing a thesis on the Yellow Peril.

He is doing special exercises to strengthen his flexor digitorum profundus.

He is writing a thesis on dialectical materialism.

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.