He is an expert in theoretical physics.

The Calopteryx cornelia is a species endemic to Japan, and it has beautiful wings.

We should always remember the power of Kannon in difficult times.

The National Research and Development Agency plays a crucial role in advancing science and technology.

Special relativity is one of the fundamental theories of physics.

General relativity is a theory of physics proposed by Einstein.

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

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.