A sub-brown dwarf is a celestial body between a planet and a brown dwarf.

Astrocytes are one of the important support cells in the brain.

He said, 'A nameless star comes out in the evening,' teaching me that achieving a goal is not easy.

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.