A scorching heat wave in two of India’s most populous states has overwhelmed hospitals, filled a morgue to capacity and disrupted power supply, forcing staff to use books to cool patients. Officials are investigating a death toll that has reached nearly 170 in recent days. In Ballia district in Uttar Pradesh state, residents are scared of going outside after midmorning. The largest hospital is unable to accommodate more patients. Officials say the morgue was full after 54 people, all of whom were elderly suffering from various health issues, died. Some families were asked to take the bodies o…