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Metaverse (other)
The metaverse is a loosely defined term referring to virtual worlds in which users represented by Avatar (computing), avatars interact, usually in 3D and focused on social and economic connection. The term ''metaverse'' originated in the 1992 science fiction novel ''Snow Crash'' as a portmanteau of "Meta (prefix), meta" and "universe". In ''Snow Crash'', the metaverse is envisioned as a hypothetical iteration of the Internet as a single, universal, and immersive virtual world that is facilitated by the use of virtual reality (VR) and augmented reality (AR) headsets. The term "metaverse" is often linked to virtual reality technology, and beginning in the early 2020s, with Web3. The term has been used as a buzzword by companies to exaggerate the development progress of various related technologies and projects for public relations purposes. Information privacy, user addiction, and user safety are concerns within the metaverse, stemming from challenges facing the social media ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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The second (symbol: s) is the unit of Time in physics, time in the International System of Units (SI), historically defined as of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of Units (SI) is more precise:The second [...] is defined by taking the fixed numerical value of the caesium frequency, Δ''ν''Cs, the unperturbed Ground state, ground-state hyperfine structure, hyperfine transition frequency of the caesium-133, caesium 133 atom, to be when expressed in the unit Hz, which is equal to s−1. This current definition was adopted in 1967 when it became feasible to define the second based on fundamental properties of nature with caesium clocks. Because the speed of Earth's rotation varies and is slowing ΔT (timekeeping), ever so slightly, a leap second is added at irregular intervals to civil time to ke ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
