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  2. Climate change - Wikipedia

    en.wikipedia.org/wiki/Climate_change

    Climate change. Changes in surface air temperature over the past 50 years. [ 1] The Arctic has warmed the most, and temperatures on land have generally increased more than sea surface temperatures. Earth's average surface air temperature has increased almost 1.5 °C (about 2.5 °F) since the Industrial Revolution.

  3. Academic grading in the United States - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_the...

    v. t. e. In the United States, academic grading commonly takes on the form of five, six or seven letter grades. Traditionally, the grades are A+, A, A−, B+, B, B−, C+, C, C−, D+, D, D− and F, with A+ being the highest and F being lowest. In some cases, grades can also be numerical. Numeric-to-letter-grade conversions generally vary from ...

  4. List of countries by tax rates - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_tax_rates

    0% (free zone companies, [226] as well as mainland companies with less than 375,000 AED a year in profit, [227] may need to fill out a tax return) 9% (for mainland companies with a net profit over AED 375,000 annually, taxation paid to other countries credited towards UAE taxation, tax return required) [ 227 ]

  5. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/Pareto_principle

    Pareto principle. The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity[ 1][ 2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital ...

  6. Isopropyl alcohol - Wikipedia

    en.wikipedia.org/wiki/Isopropyl_alcohol

    Isopropyl alcohol (IUPAC name propan-2-ol and also called isopropanol or 2-propanol) is a colorless, flammable organic compound with a pungent alcoholic odor. [9]Isopropyl alcohol, an organic polar molecule, is miscible in water, ethanol, and chloroform, demonstrating its ability to dissolve a wide range of substances including ethyl cellulose, polyvinyl butyral, oils, alkaloids, and natural ...

  7. Caffeine - Wikipedia

    en.wikipedia.org/wiki/Caffeine

    Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. [ 9] It is mainly used as a eugeroic ( wakefulness promoter) or as a mild cognitive enhancer to increase alertness and attentional performance. [ 10][ 11] Caffeine acts by blocking binding of adenosine to the adenosine A 1 receptor, which enhances release of the ...

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