Scientists from NASA and Arizona State University (ASU) in the US have developed a new way of detecting bone loss that promises to be safer and capable of earlier diagnosis than current methods that rely on X-rays. They write about their work in a study due to be published in PNAS this week. Osteoporosis, where loss of bone causes bones to grow weaker, threatens more than half of the over-50s in the US. Bone loss also occurs in the advanced stages of some types of cancer...

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