How an abacus works

Video that shows how to do additions, subtractions, multiplications and divisions with an abacus.

What is an atoll?

Information about atolls.

What is an Emulsion?

An emulsion is a mixture of two or more immiscible liquids.

Object reference not set to an instance of an object.

Observe an animation showing the formation of an arch.

Arch formation

The Earth is an ecosystem

1.1. The elements of the Earth's ecosystem Planet Earth is made up of four interrelated elements: The lithosphere, or the Earth's surface. The hydrosphere, or all of the water on the planet. The…

Make an Earth day card

In this activity we create an Earth day card by dragging and dropping elements. We can print the final result.

An evening with Daniel Goleman

Daniel Goleman introduces the key ideas from his new book Focus and relates this back to his groundbreaking work on Emotional Intelligence. This talk was rec...

Spain: Forging an Immigration Policy

In the mid-1990s, immigration became a matter of vital importance to Spain's political elites and in the eyes of the public.

An interview with Alexander Cookland

In this lesson we talk about characters and facts in the news. We exchange opinions about celebrities and the world of fame. We report what other people say. We revise and practise the pronunciation of…