This document gives information about a special type of radiation which is highly detrimental to human health and terrestrial ecosystem.Cosmic rays are charged subatomic particles. They are electrically charged particles. Cosmic rays are mostly protons and ions, which have positive charges. A small percentage are electrons, which have negative charges. Cosmic rays pour down on Earth like a constant rain. We don't much notice these high-energy particles, but they may have played a role in the evolution of life on our planet. Cosmic rays are mostly high-energy protons originating from supernova shock waves. It is difficult to precise trace where a cosmic ray came from because its trajectory is bent by magnetic fields. In fact, a typical cosmic ray will bounce inside the galaxy's magnetic field for millions of years before eventually colliding with something… like Earth. Every square centimeter on the top of the Earth's atmosphere is hit by several cosmic rays per second. This is forever going on. None of these "primary" cosmic rays ever reach us on the ground. Instead, they collide with atoms in the upper atmosphere, creating a shower of lower energy "secondary" particles. At sea level, the majority of cosmic ray secondaries are highly penetrating muons. About 10,000 muons pass through our bodies every minute. Some of these muons will ionize molecules as they go through our flesh, occasionally leading to genetic mutations that may be harmful.The passage of a cosmic ray through your body can leave various fluids within your body momentarily ionized.