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2. Twin paradox - Wikipedia

   en.wikipedia.org/wiki/Twin_paradox

   Consider a space ship traveling from Earth to the nearest star system: a distance d = 4 light years away, at a speed v = 0.8c (i.e., 80% of the speed of light). To make the numbers easy, the ship is assumed to attain full speed in a negligible time upon departure (even though it would actually take about 9 months accelerating at 1 g to get up ...

3. Double-track railway - Wikipedia

   en.wikipedia.org/wiki/Double-track_railway

   In any given country, rail traffic generally runs to one side of a double-track line, not always the same side as road traffic. Thus in Belgium, China, France (apart from the classic lines of the former German Alsace and Lorraine), Sweden (apart from Malmö and further south), Switzerland, Italy and Portugal for example, the railways use left-hand running, while the roads use right-hand running.

4. List of Metro (Minnesota) light rail stations - Wikipedia

   en.wikipedia.org/wiki/List_of_Metro_(Minnesota...

   By ridership, it is the ninth-largest light rail system in the United States. [3] Construction on the Blue Line, which was initially known as the Hiawatha Line, began in 2001. [4] The line opened in two phases in 2004, beginning with a 12-station stretch from the Warehouse District/Hennepin Avenue station through the Fort Snelling station in June.

5. Time for the Stars - Wikipedia

   en.wikipedia.org/wiki/Time_for_the_Stars

   Time for the Stars is a juvenile science fiction novel by American writer Robert A. Heinlein, published by Scribner's in 1956 as one of the Heinlein juveniles.The basic plot line is derived from a 1911 thought experiment in special relativity, commonly called the twin paradox, proposed by French physicist Paul Langevin.

6. Metro Blue Line (Minnesota) - Wikipedia

   en.wikipedia.org/wiki/Metro_Blue_Line_(Minnesota)

   The Metro Blue Line is a 12-mile (19.3 km) [2] light rail line in Hennepin County, Minnesota, that is part of the Metro network. It travels from downtown Minneapolis to Minneapolis–Saint Paul International Airport and the southern suburb of Bloomington.

7. New travel system for Europe delayed again, to 2025 - AOL

   www.aol.com/travel-system-europe-delayed-again...

   New travel system for Europe delayed again, to 2025. Marley Jay. December 16, 2023 at 6:18 AM. Leonhard Simon. Americans who are planning to visit Europe in 2024 don’t have to worry about ...