Read the passage below and summarize it using one sentence. Type your response in the box at the bottom of the screen. You have 10 minutes to finish this task. Your response will be judged on the quality of your writing and on how well your response presents the key points in the passage.

For generations people have been saying that laughter is good medicine. And now the scientists have taken an interest it turns out great-grandma was right. The boffins have discovered that laughter releases helpful goodies in the body which boost your immune system.

In fact the therapeutic benefits of laughter are now being harnessed by academia and the business community into laughter workshops and other formalised chuckle sessions. Get the workers laughing and you raise productivity, so it seems.

However it is extremely easy to get humour wrong. And a joke that's sent to someone who doesn't see the funny side will create more ill health through raised blood pressure than a few laughs could ever cure.

People often say that the internet's international nature makes it an unsuitable environment for humour for fear of it not translating across national boundaries - and inadvertently causing offence. But there are a couple of simple rules which - although not universal panaceas that always work - can help you use humour without risk.