This paper describes the three learning events, hosted by the MENA Water Department, under the Seminar Series, H2KNOW: Innovation in the Science, Technology, and Economics of Water. Through this series, World Bank staff and consultants were given an opportunity to learn about innovations within the water sector worldwide, and gain access to cutting edge knowledge on the most up-to-date in water management strategies. More specifically, the sessions covered: potential applications of renewable energy in desalination in MENA, earth observation and remote sensing applications for better water and environment management, and wastewater reuse in the Arab world. More than fifty leading experts in academic research, the private sector and US federal government agencies were invited to share their knowledge and inform project work of World Bank staff. The title of the three sessions are as follows: Renewable Energy Desalination: An Emerging Solution to Close MENA's Water Gap, on 26 January 2012; Using Satellites for Better Water and Environment Management, on 29 February 2012; and Wastewater Reuse in MENA, on 2 May 2012. A summary of each session is provided. Full seminar descriptions (with agendas) are included in Annexes 1, 2 and 3 respectively.