1 You have signs of infection, such as: 2  Increased pain, swelling, warmth, or redness around the bite. 3  Red streaks leading from the bite. 4  Pus draining from the bite.  A fever.
A negative index of refraction due to three-dimensional chirality is demonstrated for abilayered metamaterial based on pairs of mutually twisted planar metal patterns in parallel planes, which alsoshows negative electric and magnetic responses and exceptionally strong optical activity and circular dichro-ism.
As an introduction to our nemesis in this question, positrons are electrons that have positive instead of negative charge. They pull of this feat by being the antimatter version of electrons. Now, beta decay by itself really isn't all that dangerous unless you eat a beta emitter - beta particles/electrons have enough energy to burn the skin but not enough to cause serious damage.