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https://www.youtube.com/watch?v=MLbRdqkCG4w

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https://www.youtube.com/watch?v=5e14kuSVDm4

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https://www.youtube.com/watch?v=AOwRb584r1c

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https://www.youtube.com/watch?v=160GmnKOeps

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https://www.youtube.com/watch?v=Q2MIjTdSdcs&list=PLOD-MgK-HT3Aqe84aqAIAnYrKPKhFOqfp

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https://www.youtube.com/watch?v=qpqkcr6srB8

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https://www.youtube.com/watch?v=1TfPkrDRDKE

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As its name suggests, this is a considerably larger portal, capable of transporting much larger volumes of matter over greater distances.
When Alyx and Gordon escape from City 17 during the uprising, they see in the distance the remains of the Citadel, and the infant superportal, which was said if it were to open, would allow Combine units to sweep in and recapture Earth. However, Superportals take a while to gain strength before opening; sometimes, causing portal storms in the process.

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During the Uprising the Resistance was able to develop new advancements in portal technology that allowed for single-dimensional travel. The Combine, developing alongside the Resistance, were able to make advancements, however, were still unable to discover the means of single-dimension teleportation (due to their inability to factor in the Dark energy equations), and were forced to use much slower and conventional means of transportation if they wanted to stay within a single dimension.

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La ricerca sulla tecnologia del portale da parte della scienza di Aperture si è concentrata sui viaggi all'interno della stessa dimensione. La tecnologia dei portali è stata scoperta con molta più facilità e molto prima rispetto a Black Mesa. La tecnologia sembrava essere stata utilizzata per la prima volta negli anni '50 sotto forma di Aperture Science Portable Quantum Tunneling Device, che alla fine fu semplificata nel molto più portatile Aperture Science Handheld Portal Device. L'ASHPD, o "Portal Gun", è stato utilizzato come metodo rapido per viaggiare su distanze potenzialmente illimitate.
Questi portali seguono uno stile di portale più semplificato, in cui la luce è in grado di entrare nel portale e inviare un'immagine di entrambi i lati. Consentono inoltre un transito più istantaneo tra i portali, poiché si tratta semplicemente di entrare e apparire dall'altro. La possibilità di posizionarli su qualsiasi superficie piana con fori o una superficie di roccia lunare per attaccare un portale a li rende molto più versatili ed efficienti rispetto alle loro controparti Black Mesa.

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Teleportation, Portals, or Displacement, are a means of transferring matter between two locations or Dimensions, regardless of their proximity. It is the central and most pivotal theme of the Half-life universe. Via technological artifice, teleportation is usually achieved instantaneously. The most common and popular form of teleportation is to use a portal; essentially two connected gateways, which allow an object entering one gateway to leave via the other. Another method was investigated by Black mesa, and later improved upon by the Resistance. Teleportation was a major field of study at Black mesa, and their portals were used primarily in the procurement of Xen Crystals, as they were used to transport scientists to and from the Borderworld for research and analysis.
The portals can be used to travel between Xen and Earth, however, portals that allow for travel within the same dimension can be found across the facility, notably in the Lambda Reactor Core, which contains 9 portals, three on each of its three levels. Both Gordon Freeman (through the Black Mesa's lambda core teleport) and Barney Calhoun traveled to Xen through such a teleport to escape from Black Mesa before its destruction.
The Displacer Cannon, found and used by Adrian Shepherd, also allows for inter-dimensional travel.
During his brief visit to Xen, Barney is also required to activate and calibrate a "focal point," which was then used by Doctor Rosenberg to teleport several members of the Science teams outside of Black Mesa.

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The Nihilanth is capable of actively holding the dimensional rift caused by the Resonance Cascade open, though not of opening a new one. It can control when and where its vortigaunt minions are teleported to a fair degree.

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Xen , is the Borderworld, a plane of existence connecting two or more dimensions (which Xen can be referred to as). It was discovered by Black mesa research scientists, who regularly traveled there via Teleportation to collect samples and study the myriad species of flora and fauna within, despite the extremely high risk of doing so.  Residence teleportation are dependent on Xen for intra-dimensional transportation, since the matter stream utilizes the Borderworld as a slingshot to teleport into local space. The G-man also stated at the end of Half-life that he and his "employers" are in control of Xen after the defeat of the Nihilanth. While the G-Man says this, dead Marines, a destroyed tank, and a downed fighter jet can be seen, implying that American military forces have failed at their mission.

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The Resonance Cascade is a cataclysmic quantum event created after the insertion of Xen crystal sample into the Anti-mass Spectrometer at Black mesa by Gordon Freeman, culminating in the Black Mesa incident. According to notes from Gordon's desk, every object has a set resonance. When studied, the object will resonate even more, and sometimes even rapidly. If the object resonates too much, it can open dimensional rifts and portals. The Xen Crystal sample studied at Black Mesa resonated enough to tear a rift between Xen and Earth.
While appearing to have been a contained event, it did in fact have repercussions across the entire planet. The Resonance Cascade was the cause of not only the interdimensional rift, but also all following events. It sparked Portal Storms across the Earth, and ultimately led to the Seven Hour war and the Combine invasion of the planet.
The Resonance Cascade is therefore arguably the single most significant event in the entire Half-life timeline, having been the cause of the events that take place in every single game.

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Sector C is notable primarily for housing the Anomalous Materials Laboratories, Gordon Freeman's workplace. This area contains the anti-mass spectrometer, the initial source of the Black Mesa Incident, the starting point of the Half-life series.

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Occurring on may 16, 200-, the Black Mesa Incident is caused directly by a failed experiment in Sector C, triggering a resonance. This leads to the invasion of the facility by XEN creatures and to severe damage, and finally its complete destruction by a thermonuclear bomb.