He is a world-renowned osteologist.

He is a renowned anthropologist, traveling around the world to study human cultures.

He is a renowned political scientist who has written many important papers.

He is a world-famous geographer.

He is a world-famous physicist.

He likes to take a walk in the park at dusk.

New World monkeys live in South America.

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.