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19 godz. temu · The Hubble length or Hubble distance is a unit of distance in cosmology, defined as cH −1 — the speed of light multiplied by the Hubble time. It is equivalent to 4,420 million parsecs or 14.4 billion light years. (The numerical value of the Hubble length in light years is, by definition, equal to that of the Hubble time in years.)
19 godz. temu · A car, or an automobile, is a motor vehicle with wheels.Most definitions of cars state that they run primarily on roads, seat one to eight people, have four wheels, and mainly transport people over cargo.. The French inventor Nicolas-Joseph Cugnot built the first steam-powered road vehicle in 1769, while the Swiss inventor François Isaac de Rivaz designed and constructed the first internal ...
19 godz. temu · The Shanghai maglev train (SMT) or Shanghai Transrapid (Chinese: 上海磁浮示范运营线; pinyin: Shànghǎi Cífú Shìfàn Yùnyíng Xiàn; lit. ' Shanghai Maglev Demonstration Operation Line ') is a magnetic levitation train (maglev) line that operates in Shanghai, China.The line uses the German Transrapid technology. The Shanghai maglev is the world's first commercial high-speed maglev ...
19 godz. temu · According to experts, by 2050, the number of myopia sufferers will grow to 4,758 million. "We are noticing an increase in cases in consultations with children: there are more people with myopia, and it progresses faster. By itself, the light from the screens does not harm the eyes. But the misuse of gadgets favors [these optical problems].
19 godz. temu · Educational research. Educational technology (commonly abbreviated as edutech, or edtech) is the combined use of computer hardware, software, and educational theory and practice to facilitate learning. [1] [2] When referred to with its abbreviation, "EdTech", it often refers to the industry of companies that create educational technology.
19 godz. temu · This is a list of cities in the world by nominal gross domestic product (GDP).The United Nations uses three definitions for what constitutes a city, as not all cities may be classified using the same criteria. Cities may be defined as the cities proper, the extent of their urban area, or their metropolitan regions. The methodology of calculating GDP may differ between the studies and are ...
