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Although a common classroom experiment is often explained this way, Bernoulli's principle only applies within a flow field, and the air above and below the paper is in different flow fields. The paper rises because the air follows the curve of the paper and a curved streamline will develop pressure differences perpendicular to the airflow.
However the exam papers of the GCSE sometimes had a choice of questions, designed for the more able and the less able candidates. When introduced the GCSEs were graded from A to G, with a C being set as roughly equivalent to an O-Level Grade C or a CSE Grade 1 and thus achievable by roughly the top 25% of each cohort.
Von Ranke, for example, professionalized history and set the world standard for historiography. By the 1830s mathematics, physics, chemistry, and biology had emerged with world class science, led by Alexander von Humboldt in natural science and Carl Friedrich Gauss in mathematics. Young intellectuals often turned to politics, but their support ...
[36] [37] Since then, the population has slowly risen again, and as of 2021, was estimated to be at 15.2 million by the demographer Sergio Della Pergola [2] or less than 0.2% of the total world population in 2012. [38] [b] Today, over 85% of Jews live in Israel or the United States. Israel, whose population is 73.9% Jewish, is the only country ...