The World Health Organization is working to improve public health worldwide.

The World Trade Organization is an important organization that sets the rules for international trade.

She is conducting research on the world's oldest profession.

Old World monkeys primarily inhabit Africa and Asia.

The World Health Organization is working to improve public health worldwide.

When he had a problem due to his own actions, he remembered the phrase 'chickens come home to roost'.

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.