Why is the ocean salty?

🌊🧂🌊🧂🌊🧂🌊

How do watches keep time?

A small land called Watchland

How do car engines work?

The speedy snails of our roads

Dragons in the sky

What are dragons?

The Universe, a Big, Big Home

How big is the universe?

How do trains work?

How do waves work?

How do fish breath under water?

Dogs - humans' best friends

How did it all start?

Volcanoes, our fiery mountain-makers

The Pyramids

The history of the phone