Occam's razor is a logical principle attributed to the medieval philosopher William of Occam (or Ockham). His principle states that one should not make more assumptions than the minimum needed. This principle is often called the principle of parsimony.
According to Occams razor, the simplest answer is usually the correct answer.
"Pluralitas non est ponenda sine neccesitate" or "plurality should not be posited without necessity."
One should not increase, beyond what is necessary, the number of entities required to explain anything,
1) Occams razor theory one says "Ugly people should not reproduce."
2) Occams razor theory two says "No good deed shall go unpunished."
3) Occams razor theory three says "Keep it Simple, Stupid."
4) Occams razor theory four says "If it walks like a duck, talks like a duck, then...."