Israel is a leading country in the development of solar energy. Israel is a global leader in water conservation and geothermal energy, and its development of cutting-edge technologies in software, communications and the life sciences have evoked comparisons with Silicon Valley. According to the OECD, Israel is also ranked 1st in the world in <answer>expenditure on Research and Development</answer> (R&D) as a percentage of GDP. Intel and Microsoft built their first overseas research and development centers in Israel, and other high-tech multi-national corporations, such as IBM, Google, Apple, HP, Cisco Systems, and Motorola, have opened R&D facilities in the country.
Israel is ranked 1st in the world in what?
expenditure on Research and Development