(Photograph) - Head start: Magnetic Resonance Imaging, honed over the last decade so that it can produce a "movie" of the body's soft tissues, may be the key to understanding migraine, Laurie Hall, professor of medicinal chemistry at Cambridge University, told a Royal Society of Chemistry meeting. Professor Hall is pioneering the use of MRI to watch the early development of osteoarthritis. Sufferers are not aware of the disease until it is well advanced and painful. Scientists will now have a way of testing drugs for the disease, which affects 80 per cent of over 65-year-olds.