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.
This leads to the index of refraction of various transparent media, defined as n = cvacuum / cmedium. Thus Maxwell's theory of electro-magnetism seems to clearly imply that the speed of propagation of such electromagnetic waves depends only on the medium, and is independent of the speed of the source.