High blood pressure is highly age-related and affects more than 1 billion people worldwide. The condition is a major source of morbidity and mortality, because it makes individuals more prone to heart failure, stroke and kidney disease. Yet doctors can’t fully explain the cause of 90 per cent of all cases. Now a computer model of a “virtual human”, created by researchers at Norwegian University of Life Sciences, suggests that stiff arteries alone are enough to cause high blood pressure. The study was published in May 2014 in in PLOS Computational Biology.