Radiation is the emission of radiant energy in the form of particles
or waves, usually resulting from nuclei of unstable atoms trying to
reach a stable state. Unstable atoms were abundant in Earth's early
millennia but only as these unstable atoms became stable did it become
possible for life to thrive on Earth. While radiation is a natural
property of matter, it is not a natural part of humanity's habitat.
On the contrary, it is very harmful to people. Exposure to radiation
can lead to radiation sickness which is marked by fatigue, nausea,
vomiting, loss of teeth and hair, damage to blood-forming tissue,
and bleeding. And of course, death. Radiation is released not only
by nuclear weaponry but also by depleted uranium ammunition. U.S.
personnel were also exposed to radiation when they witnessed the testing
of atomic bombs, as were citizens in nearby communities who were showered
with the fallout.