Recent allegations in the British Medical Journal claim that a 1998 research paper, which led to widespread public concern about a potential link between the measles, mumps and rubella (MMR) vaccination and autism, was an "elaborate fraud".

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 Cracking your knuckles sounds like it would be bad for you … but does it really lead to arthritis when you get older?

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Scientists aren't really sure as to why your heart rate is linked with your breathing, but some studies suggest that the human body saves energy in this way, by increasing the efficiency of oxygen and carbon dioxide exchange in your lungs.

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