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Guy Martin is a professional motorbike racer. In this video, he tries to ride a motorbike on water. Can he ride fast enough to do it?

A cuttlefish is a common sea animal with an amazing ability to change appearance. Are there any limits to this ability? Watch this video to find out.

We usually think of fruit as a healthy food. But could it also have some negative effects?

Dolphins are much more intelligent than humans when it comes to fishing: they don’t even need a net. Watch this video to see how they do it.

Learn how to write about trends in a bar chart.

Cucumber or grapes? What happens when two monkeys do the same task but get 'paid' in different ways? Watch this funny video to find out how monkeys react to inequality.

Learn how to use short forms like yes, I have and yes, I do to answer questions, and do the exercises to practise using them.

Do you know how to use in, on and at to talk about location? Test what you know with interactive exercises and read the explanation to help you.

Do you know how and when to use an infinitive to talk about purpose? Test what you know with interactive exercises and read the explanation to help you.

Do you know how and when to use at, in and on to talk about time? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to use have and have got? Test what you know with interactive exercises and read the explanation to help you.

Do you know how to use there is and there are? Test what you know with interactive exercises and read the explanation to help you.