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"Lack of aerobic fitness may impair how the heart copes with the stress of running a marathon, Larose and his colleagues said. "This is not a permanent injury that will leave any type of scar," said Larose, a professor of medicine at Laval University at Quebec City."

"A British caving team believe they have discovered the world's largest cave passage in the heart of the Vietnamese jungle. The rocky passage is 150metres long and measures a towering 200metres in height - seven times as high as the vaulted ceiling of York Cathedral."

"Obesity has a greater impact on the blood pressure of teenage girls than on teenage boys, a US study has suggested. High blood pressure is a risk factor for heart disease and stroke in later life. The study of 1,700 teenagers, presented to the American Physiological Society conference, found girls had three times the risk of higher blood pressure."