Evil may be the last of man's problems still untouched by scientific methodology. Consider the virus. Little more than encoded information and instruction, the virus is the stripped-down, bare bones version of life, possibly the absolute minimum for biological replication. It has found advantage in manipulating and exploiting other organism's genetic transmission for its own ends hitching a ride, as it were, on a host's mitotic cellular reproduction. It physically invades and overrules its host's genetic code, substituting its own plan.
Viruses are curious things, unlike any other life form.
They look like crystals under a microscope and contain only particles of DNA or RNA enclosed in a protein coat. Once activated by the presence of a host, they must invade and use its machinery for their metabolism and reproduction. They are a seed whose soil is the genetic code of other organisms. There is a reptilian brain buried within the human brain. The moment we take an active role in guiding our lives, we encounter ancient forces that influenced our evolution long before we stood up on our hind legs and became sentient beings.