The Empire of Japan, written as 大日本帝國 in Kyūjitai, was a nation that existed from 1868 to 1945.

The Imperial Japanese Army was a Japanese military force that existed from the Meiji era to the Showa era.

The Imperial Japanese Navy was once the navy of Japan.

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.

Strontium is one of the elements abundantly present in the earth's crust.

The top quark is the heaviest quark in particle physics.

This bacterium is about 1 micrometre in size.

A femtometer is a unit of length, equal to 10 to the negative 15th power of a meter.

It's 5 kilometers from my house to school.

The thickness of this notebook is about 10 millimeters.