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Time travel is the hypothetical activity of traveling into the past or future. Time travel is a concept in philosophy and fiction, particularly science fiction. In fiction, time travel is typically achieved through the use of a device known as a time machine. The idea of a time machine was popularized by H. G. Wells's 1895 novel The Time ...
Time portals are doorways in time, employed in various fiction genres, especially science fiction and fantasy, to transport characters to the past or future.. They differ from time machines in being a permanent or semi-permanent fixture linking specific points in time, and thus are an especially useful plot device when the plot involves characters moving many times back and forth.
Another term for a clear signal, derived from the days of steam where a station operator would hoist a large wooden ball up a standard, signaling that the engineer was authorized to proceed [38] [71] [134] [136] A slang term used among railroad employees to convey to the crew of a train that they were clear to proceed [137] [138] High cube (US)
Travel is the movement of people between distant geographical locations. Travel can be done by foot, bicycle, automobile, train, boat, bus, airplane, ship or other means, with or without luggage, and can be one way or round trip. [1] Travel can also include relatively short stays between successive movements, as in the case of tourism.
Smeenk uses the term "predestination paradox" to refer specifically to situations in which a time traveler goes back in time to try to prevent some event in the past. [7] The "predestination paradox" is a concept in time travel and temporal mechanics, often explored in science fiction.
Jiffy can be an informal term for any unspecified short period, as in "I will be back in a jiffy". From this, it has acquired a number of more precise applications as the name of multiple units of measurement , each used to express or measure very brief durations of time.
Commercial flights are often categorized into long-, medium- or short-haul by commercial airlines based on flight length, although there is no international standard definition. The related term flight time is defined by ICAO (International Civil Aviation Organization) as "The total time from the moment an aeroplane first moves for the purpose ...
A short-term mission (STM) is the mobilization of a Christian missionary for a short period of time ranging from days to a year; many short-term missions are called mission trips. The short-term missionary is a fairly recent innovation in the global missions movement, but many short-term missions agencies are seeing an increased number of trips ...