some methods have a uncertain planets on mankind mind & if something has a uncertain smell on another thing, then the affair is benificial ->  some microorganisms are benificial to human body  if something has a yes information on another thing, then the affair is harmful & disease-causing pink have a yes conjugate on the mind ->  some disease-causing microbes are harmful to human body  some microorganisms are benificial to human body & some disease-causing microbes are harmful to human body -> the relationship between human and microorganisms is sometimes beneficial and sometimes harmful