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  2. Academic grading in the United States - Wikipedia

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

    For example, daily homework may be counted as 50% of the final grade, chapter quizzes may count for 20%, the comprehensive final exam may count for 20%, and a major project may count for the remaining 10%. Each are created to evaluate the students' understanding of the material and of their complex understanding of the course material.

  3. Attention deficit hyperactivity disorder - Wikipedia

    en.wikipedia.org/wiki/Attention_deficit...

    0.8–1.5% (2019, using DSM-IV-TR and ICD-10) [2] Attention deficit hyperactivity disorder ( ADHD) is a neurodevelopmental disorder characterised by executive dysfunction occasioning symptoms of inattention, hyperactivity, impulsivity and emotional dysregulation that are excessive and pervasive, impairing in multiple contexts, and otherwise age ...

  4. Sickle cell disease - Wikipedia

    en.wikipedia.org/wiki/Sickle_cell_disease

    About 90% of people survive to age 20, and close to 50% survive beyond age 50. In 2001, according to one study performed in Jamaica, the estimated mean survival for people was 53 years for men and 58 years for women with homozygous SCD. [126]

  5. Amazon rainforest - Wikipedia

    en.wikipedia.org/wiki/Amazon_rainforest

    5,500,000 km 2 (2,100,000 sq mi) The Amazon rainforest, [a] also called Amazon jungle or Amazonia, is a moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America. This basin encompasses 7,000,000 km 2 (2,700,000 sq mi), [2] of which 6,000,000 km 2 (2,300,000 sq mi) are covered by the ...

  6. Ethanol - Wikipedia

    en.wikipedia.org/wiki/Ethanol

    Ethanol is the oldest known sedative, used as an oral general anesthetic during surgery in ancient Mesopotamia and in medieval times. [16] [17] Mild intoxication starts at a blood alcohol concentration of 0.03-0.05 % and induces anesthetic coma at 0.4%. [25] However, this use carried the high risk of deadly alcohol intoxication and pulmonary ...

  7. Fifty Shades of Grey - Wikipedia

    en.wikipedia.org/wiki/Fifty_Shades_of_Grey

    Fifty Shades Darker. Fifty Shades of Grey is a 2011 erotic romance novel by British author E. L. James. [1] It became the first installment in the Fifty Shades novel series that follows the deepening relationship between a college graduate, Anastasia Steele, and a young business magnate, Christian Grey. It contains explicitly erotic scenes ...

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