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Ultimately laughter is good for your health. Laughter protects your heart by improving the function of blood vessels and increases blood flow. This can help prevent you from a heart attack or other cardiovascular problems. Laughter boots your immune system and improves your body's ability to fight off diseases.

It's the kind of moment that comes rarely, but tech journalists live for it: a service is launched with little fanfare and receives a sudden, energetic burst of genuine buzz. Developers start remixing it in all kinds of fascinating ways. It's supremely easy to use, and mobile, so we get hooked.

Laughing at Charlie Chaplin can be a serious business. Chortling at a funny film may seem to be an activity with few consequences for health, but research shows that it does more than exercise the 20 or so face muscles involved in laughing.