AntiMatter

in 1920 Paul Dirac predicted anti-matter mathematically.

Carl David Anderson (1905-91) received Nobel prize in 1936 for the discovery of the positron. In 1936, with Seth Neddermeyer, Anderson also discovered the positive and negative "mesotron", now called the muon. Thus he added three new particles to physics and pointed the way to the existence of antimatter. To obtain more intense, higher energy cosmic rays, the pair transported their magnet cloud chamber to the summit of Pike's Peak, colorado. Analyzing the cloud chamber photos after the summer at the Peak, they found positive and negative tracks that were different from electrons and protons and appeared to have intermediate mass.

The existance of anti-protons and anti-neutrons was confirmed experimentally in 1955. Since then, the full range of anti-particles has been confirmed.

In particle physics, antimatter is the extension of the concept of the antiparticle to matter, where antimatter is composed of antiparticles in the same way that normal matter is composed of particles. For example, an antielectron (a positron, an electron with a positive charge) and an antiproton (a proton with a negative charge) could form an antihydrogen atom in the same way that an electron and a proton form a normal matter hydrogen atom. Furthermore, mixing matter and antimatter would lead to the annihilation of both giving rise to high-energy photons (gamma rays) or other particle–antiparticle pairs.

There is considerable speculation as to why the observable universe is apparently almost entirely matter, whether there exist other places that are almost entirely antimatter instead, and what might be possible if antimatter could be harnessed, but at this time the apparent asymmetry of matter and antimatter in the visible universe is one of the greatest unsolved problems in physics. The process by which this asymmetry between particles and antiparticles developed is called baryogenesis.

One way to denote an antiparticle is by adding a bar over the particle's symbol. For example, the proton and antiproton are denoted as p and p, respectively.

from http://en.wikipedia.org/wiki/Antimatter

Each particle has its own anti-particle.

The Anti matter universe is the exact same as our universe, time will work in a similar matter, the laws of physics still work the same way, electronic equipment would be feasible. Everything you know would work the same way, except in school where you would call an electron positive and a proton negative ...

e+ positron, e– electron.

Positrons

Positrons were reported^[15] in November 2008 to have been generated by Lawrence Livermore National Laboratory in larger numbers than by any previous synthetic process. A laser drove ionized electrons through a millimeter radius gold target's nuclei, which caused the incoming electrons to emit energy quanta, that decayed into both matter and antimatter. Positrons were detected at a higher rate and in greater density than ever previously detected in a laboratory.

Previous experiments made smaller quantities of positrons using lasers and paper-thin targets; however, new simulations showed that short, ultra-intense lasers and millimeter-thick gold are a far more effective source.^[16]

from http://en.wikipedia.org/wiki/Antimatter

Pair production: two particles produced from energy.

γ rays → e⁺ + e^–

conserve charge, momentum.

Annihilation