JERUSALEM: What is Israel’s best bomb shelter? And when is the best time of day to shower without interruption from a missile alert? The Middle East war that began with US and Israeli strikes on Iran has provoked waves of retaliatory Iranian fire as well as some tricky questions for Jews and Arabs from Tel Aviv to Jerusalem. A new app, which went viral in the country within hours of launching, uses statistical analysis of recent air raid alerts in specific areas to guide users on the optimal time of day to bathe, while limiting the chances of having to run for cover mid-wash.