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These vests help users endure virtual blows, literally. An American surgeon has invented a vest that lets computer game users feel physical attacks like shots, stabs, etc. while playing games. The vest uses air pressure and feedback from the computer to simulate thumps on those regions of a person’s torso, which would have been hit if the person were actually fighting in a battle. It’s designed by Mark Ombrellaro and was originally intended for medical purposes.
In Physics, quantum is the particle which obeys quantum mechanics. When a quantum particle has to cross a potential barrier which has more energy than the particle, then, according to classical physics, it cannot do so. But, in quantum mechanics, it can, however small it be. This phenomenon is known as quantum tunnelling. The best example of quantum tunnelling is the emission of alpha particles from a radioactive nucleus . Although the energy of alpha particles is less than nuclear potential, they can tunnel through it.
Hypercube is the generalisation in n-dimensions of a square in two dimensions and a cube in three dimensions. A square has four vertices (22), a cube, 8 vertices (23). Similarly, an n-dimensional hypercube has 2n vertices. In the famous painting ‘Christus Hypercubus’, Salvador Dali depicted Christ crucified on an unfolded four-dimensional hypercube. Examining the shadow of a cube reveals a square within a square. Similarly, the shadow of a four-dimensional hypercube will be a cube within a cube.
Tachyons (a Greek word meaning swift) are hypothetical particles which travel with a velocity greater than the speed of light in vacuum (or superluminal velocity) and represent the instability of the system. The first description of tachyons was given by German physicist Arnold Sommerfeld. But George Sudarshan, Olexa-Myron Bilaniuk and Gerald Feinberg (who originally coined the term) in the 1960s advanced a theoretical framework for their study. In terms of Einstein’s special relativity theory, these particles have space-like four momentum (momentum in four-dimensional coordinate system) and imaginary proper time. These particles generate Cherenkov radiation (the light equivalent of a sonic boom) when they cross the light barrier. However, according to special relativity such particles don’t exist in reality and even if they did they wouldn’t be able to transmit information or signals.
