Male humans have about a 10% larger brain than females. A study of 46 adults aged 22-49 years found an average brain volume of 1273.6cc for men, ranging from 1052.9 to 1498.5cc, and 1131.1cc for women, ranging from 974.9 to 1398.1cc.
World distribution of hydropower. 1  Hydropower is the most important and widely-used renewable source of energy. 2  Hydropower represents about 16% (International Energy Agency) of total electricity production. 3  China is the largest producer of hydroelectricity, followed by Canada, Brazil, and the United States (Source: Energy Information Administration).
Despite the Three Gorges dam's growing list of problems, however, hydropower remains an integralâand ostensibly greenâcomponent of China's energy mix. China still draws 82 percent of energy from coal, but large dams are crucial to the country's climate change program, which aims to increase its proportion of electricity from renewable resources from the current 7.2 percent to 15 percent by 2020.