The Triassic period is one of the geological ages, referring to the period from about 252 million years ago to about 251 million years ago.

The Mesolithic is the era between the Paleolithic and the Neolithic.

The Bronze Age was an important period in human history.

The Azuchi-Momoyama period was a very important time in Japanese history.

The Azuchi-Momoyama period, also known as the Oda-Nobunaga period, was a very important time in Japanese history.

The Neolithic was an important period in human history.

The Paleolithic is the first era of human history.

This shape is a parallelogram.

Manako is my best friend.

This new app is suitable for everyone and their mother, and anyone can use it easily.