Nonspecific fever. Kids infected with coxsackievirus usually establish an unexpected fever that lasts about 3 days. Often the fever comes in two waves â it is there for a day or two, disappears for a couple of days, then returns for about 3 days.
Albert Einstein proposed the idea the light exists of quanta of energy that he called photons.
Modern physicists have demonstrated that the energy in any electromagnetic field is made up of discrete packets. The term photon (meaning visible-light particle) has been coined for these energy packets.