Indian doctors are studying an 83-year-old holy man who claims to have spent the last seven decades without food and water. Military doctors hope the experiments on Prahlad Jani can help soldiers develop their survival strategies.The long-haired and bearded yogi is under 24-hour observation by a team of 30 specialists during three weeks of tests at a hospital in the western Indian city of Ahmedabad.Two cameras have been set up in his room, while a mobile camera films him when he goes outside, guaranteeing round-the-clock observation.His body will be scanned and his brain and heart activity measured with electrodes."The observation...