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  2. Illinois - Wikipedia

    en.wikipedia.org/wiki/Illinois

    They built an urban complex of more than 100 platform and burial mounds, a 50-acre (20 ha) plaza larger than 35 football fields, [18] and a woodhenge of sacred cedar, all in a planned design expressing the culture's cosmology. Monks Mound, the center of the site, is the largest Pre-Columbian structure north of the Valley of Mexico.

  3. Photosynthetic efficiency - Wikipedia

    en.wikipedia.org/wiki/Photosynthetic_efficiency

    The following is a breakdown of the energetics of the photosynthesis process from Photosynthesis by Hall and Rao: [6]. Starting with the solar spectrum falling on a leaf, 47% lost due to photons outside the 400–700 nm active range (chlorophyll uses photons between 400 and 700 nm, extracting the energy of one 700 nm photon from each one)

  4. Ponzi scheme - Wikipedia

    en.wikipedia.org/wiki/Ponzi_scheme

    The May 2022 collapse of TerraUSD, a stablecoin propped up by a complex algorithmic mechanism offering 20% yields, was described as "Ponzinomics" by Wired. [32] Another example of a well known ponzi scheme involving cryptoassets was the ICO of AriseBank or AriseCoin , involving claims about founding the world's first "decentralized bank".

  5. South Africa - Wikipedia

    en.wikipedia.org/wiki/South_Africa

    South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa.Its nine provinces are bounded to the south by 2,798 kilometres (1,739 miles) of coastline that stretches along the South Atlantic and Indian Ocean; [14] [15] [16] to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; and to the east and northeast by Mozambique and Eswatini.

  6. 1% rule - Wikipedia

    en.wikipedia.org/wiki/1%_rule

    Pie chart showing the proportion of lurkers, contributors and creators under the 90–9–1 principle. In Internet culture, the 1% rule is a general rule of thumb pertaining to participation in an Internet community, stating that only 1% of the users of a website actively create new content, while the other 99% of the participants only lurk.

  7. Pareto principle - Wikipedia

    en.wikipedia.org/wiki/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 few").

  8. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    Magnitude transfer function of a bandpass filter with lower 3 dB cutoff frequency f 1 and upper 3 dB cutoff frequency f 2 Bode plot (a logarithmic frequency response plot) of any first-order low-pass filter with a normalized cutoff frequency at =1 and a unity gain (0 dB) passband.

  9. Academic grading in South Africa - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_South...

    Code 4 (C): 50% - 59%; Code 3 (D): 40% - 49%; Code 2 (E): 30% - 39%; Code 1 (F): 0% - 29%; The OBE system, when in its experimental stages, originally used a scale from 1 - 4 (a pass being a 3 and a '1st class pass' being above 70%), but this system was considered far too coarse and replaced by a scale from 1 to 7.

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