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"Human population numbers as a function of food supply" (PDF). Russel Hopfenburg, David Pimentel, Duke University, Durham, NC; Cornell University, Ithaca, NY. Guinnane, Timothy W. (2023). "We Do Not Know the Population of Every Country in the World for the Past Two Thousand Years". The Journal of Economic History. 83 (3): 912– 938.
Currently, 3.1 billion smartphones and tablets are in use across the world (with tablets, a small fraction of the total, generally running the same operating systems, Android or iOS, the latter being more popular on tablets. In 2019, a variant of iOS called iPadOS built for iPad tablets was released).
Entry of mixed fractions involves using decimal points to separate the parts. For example, the sequence 3. 1 5. 1 6 →cm converts 3 + 15 ⁄ 16 inches to 10.0 cm (approximately). The calculator may be set to automatically display values as mixed fractions by toggling the FDISP key. The maximum denominator may be specified using the /c function.
The thoracic fraction is the proportion of the particles in ambient aerosol that can reach the thorax or chest region. [68] The respirable fraction is the proportion of particles in the air that can reach the alveolar region. [69] To measure the respirable fraction of particles in air, a pre-collector is used with a sampling filter.
The RPS mechanism generally places an obligation on electricity supply companies to produce a specified fraction of their electricity from renewable energy sources. Certified renewable energy generators earn certificates for every unit of electricity they produce and can sell these along with their electricity to supply companies.
An investigation in 2012 discovered that unlike most sub-Saharan Africans, North Africans have similar levels of Neanderthal DNA to South Europeans and West Asians, which is pre-Neolithic in origin, rather than via any recent admixture, as the Neanderthal's genetic signals were higher in populations with an autochthonous 'back-to-Africa' genomic component that arrived 12,000 years ago.
The collapse of Lehman Brothers (headquarters pictured), the fourth-largest U.S. investment bank, on September 15, 2008, is often considered the climax of the 2008 financial crisis.