It is believed that
anti-matter lost its battle for survival against matter during the Big Bang.<br /><br />Read also:
http://en.wikipedia.org/wiki/Baryogenesis<br /><br />"In particle physics, antimatter extends the concept of the antiparticle to matter, wherin if a particle and its antiparticle come into contact with each other, the two annihilate —that is, they may both be converted into other particles with equal energy in accordance with Einstein's equation E = mc2."<br /><br />So the antimatter knife can only cut through matter as long as long as encounters the same amount of matter during which it would emit
gamma ray radiation <br /><br />Health Effects of Gamma Radiation<br /><br />Does the way a person is exposed to gamma or x-rays matter?<br /><br />Both direct (external) and internal exposure to gamma rays or X-rays are of concern. Gamma rays can travel much farther than alpha or beta particles and have enough energy to pass entirely through the body, potentially exposing all organs. A large protion gamma radiation largely passes through the body without interacting with tissue--the body is mostly empty space at the atomic level and gamma rays are vanishingly small in size. By contrast, alpha and beta particles inside the body lose all their energy by colliding with tissue and causing damage. X-rays behave in a similar way, but have slightly lower energy.<br /><br />Gamma rays do not directly ionize atoms in tissue. Instead, they transfer energy to atomic particles such as electrons (which are essentially the same as beta particles). These energized particles then interact with tissue to form ions, in the same way radionuclide-emitted alpha and beta particles would. However, because gamma rays have more penetrating energy than alpha and beta p