What does it mean to say that “A causes B?”
If you think about it, it’s not so simple.
Scientists, however, need to be a little clearer.
Ghislain & Marie David / de Lossy Cultura / Getty Imagse
They need to know if exposure to a toxin always makes people sick or only sometimes.
They need to understand if a nasty symptom can be triggered by one virus or several.
It’s not enough to simply say that one thing causes another.
Scientists have to be able to describe the nature of that association.
so that do so, they have developed terminology to describe the causal relationship between two events.
They say that causes arenecessary,sufficient, neither, or both.
Necessary Causes vs.
Some examples are:
Centers for Disease Control and Prevention.About HIV/AIDs.
NIH National Center for Advancing Translational Sciences.Tay-Sachs disease.
