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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. 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.

  4. 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.

  5. 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".

  6. Level of support for evolution - Wikipedia

    en.wikipedia.org/wiki/Level_of_support_for_evolution

    About 2/3 (65.5%) of those surveyed thought that creationism was definitely or probably true. In 2005 a Newsweek poll discovered that 80 percent of the American public thought that "God created the universe." and the Pew Research Center reported that "nearly two-thirds of Americans say that creationism should be taught alongside evolution in ...

  7. Thin-film solar cell - Wikipedia

    en.wikipedia.org/wiki/Thin-film_solar_cell

    In joint research with the New Energy and Industrial Technology Development Organization (NEDO) of Japan, Solar Frontier achieved 22.3% conversion efficiency on a 0.5 cm 2 cell using its CIS technology. This was an increase of 0.6 percentage points over the industry's previous thin-film record of 21.7%. [83]

  8. Economy of Portugal - Wikipedia

    en.wikipedia.org/wiki/Economy_of_Portugal

    When pensions are included the percentage goes down to 25.2%. 17.5% of the population were at risk of poverty after social transfers, meaning their disposable income was below their national at-risk-of-poverty threshold, which is set at 60% of the national median income per adult equivalent.

  9. 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 .