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  2. Renewable energy in the United States - Wikipedia

    en.wikipedia.org/wiki/Renewable_energy_in_the...

    A 2013 study by the US National Renewable Energy Laboratory concluded that utility-scale solar power plants directly disturb an average of 2.7 to 2.9 acres per gigawatt-hour/year, and use from 3.5 to 3.8 acres per gW-hr/year for the entire sites.

  3. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    Half-life (symbol t ½) is the time required for a quantity (of substance) to reduce to half of its initial value.The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive.

  4. Gini coefficient - Wikipedia

    en.wikipedia.org/wiki/Gini_coefficient

    As another example, in a population where the lowest 50% of individuals have no income, and the other 50% have equal income, the Gini coefficient is 0.5; whereas for another population where the lowest 75% of people have 25% of income and the top 25% have 75% of the income, the Gini index is also 0.5.

  5. Power of two - Wikipedia

    en.wikipedia.org/wiki/Power_of_two

    The first 3 powers of 2 with all but last digit odd is 2 4 = 16, 2 5 = 32 and 2 9 = 512. The next such power of 2 of form 2 n should have n of at least 6 digits. The only powers of 2 with all digits distinct are 2 0 = 1 to 2 15 = 32 768 , 2 20 = 1 048 576 and 2 29 = 536 870 912 .

  6. Economics - Wikipedia

    en.wikipedia.org/wiki/Economics

    The earlier term for the discipline was "political economy", but since the late 19th century, it has commonly been called "economics". [22] The term is ultimately derived from Ancient Greek οἰκονομία (oikonomia) which is a term for the "way (nomos) to run a household (oikos)", or in other words the know-how of an οἰκονομικός (oikonomikos), or "household or homestead manager".

  7. 2012 phenomenon - Wikipedia

    en.wikipedia.org/wiki/2012_phenomenon

    The date of 13.0.0.0.0 4 Ahau 3 Kʼankʼin ... an Ipsos poll of 16,000 adults in 21 countries found that 8 percent had experienced ... Only a fraction of that number ...

  8. 2008 financial crisis - Wikipedia

    en.wikipedia.org/wiki/2008_financial_crisis

    The percentage of citizens living in poverty rose from 12.5 percent in 2007 to 15.1 percent in 2010. The Dow Jones Industrial Average fell by 53 percent between October 2007 and March 2009, and some estimates suggest that one in four households lost 75 percent or more of their net worth .

  9. List of sovereign states by tax revenue to GDP ratio - Wikipedia

    en.wikipedia.org/wiki/List_of_sovereign_states...

    The tax percentage for each country listed in the source has been added to the chart. According to World Bank , "GDP at purchaser's prices is the sum of gross value added by all resident producers in the economy plus any product taxes and minus any subsidies not included in the value of the products.