Could Israel hold the answer to the world’s water problems? Lottie and Howard Marcus believed so. The forthcoming film Who Are the Marcuses? unlocks the mystery of this remarkable couple who made the single largest donation to the State of Israel ever. The Holocaust survivors lived most of their lives modestly before leaving a $400 million fortune they quietly amassed to fund water research at Israel’s Ben-Gurion University of the Negev, which they saw as vital to achieving peace through natural resources.