Electricity generation. The production of electricity in 2013 was 23,322TWh. Sources of electricity were coal and peat 41%, natural gas 22%, hydroelectric 16%, nuclear power 11%, oil 4%, biomass and waste 2% and other sources 4%.
The nine Supreme Court Justices on the Supreme Court of the United States are the final arbiters on whether or not a law passed by the legislative branch is constitutional.
The Supreme Court has nine justices: a chief justice and eight associate justices. Supreme Court justices are nominated by the president and confirmed by the Senate. Justices are appointed for life, although they may be impeached by Congress for misbehavior (this has happened only once, in 1805).