Zosimus
Non-Christian non-evolution believer
Why not?
Why not? That's a good question. The reason is that most scientific laws and theories are casual in nature. The theory of common descent, for example, is said to cause nested hierarchies.
As such we can say, "If common descent is true, then nested hierarchies will occur," but we cannot say "If we observe nested hierarchies, then common descent will occur."
Nested hierarchies do not cause common descent.
Let's compare this theory to a simple theory:
If it rains, then the streets will be wet. Most people will agree with this theory because they either know or believe that rain causes wet streets. No one I know of thinks that by wetting down the street you can cause rain.
So if you leave your house and note that the street is wet, you may think, "Well, it must have rained," and maybe you're even right, but you have not proved that it rained just by seeing a wet street. There could, however, be many other causes. Maybe it snowed, and the snow all melted. Maybe the water company had a broken pipe. Maybe a dam broke. Maybe a water bottle truck overturned. Maybe someone washed his car. All of these theories are consistent with the wet street observation. Even if I was unable to think of all of these possibilities, it is entirely possible that someone may think of an alternate explanation that I never considered.
However, you can look at it the other way. When you leave your house and you see that the street is dry you can say, "Since rain causes the street to be wet, and since the street is not wet, it can't have rained." This is a valid logical chain. This is also the value of science. If someone says that heavy objects fall faster than lighter objects, you could prove this theory incorrect.
Accordingly science can only make progress when two theories are in play and each theory makes different predictions about a possible situation. At this point the two theories can be put head-to-head and one of the theories will win. What this means is that the theory that failed to predict the outcome is wrong but it does not mean that the theory that successfully predicted the outcome is right.
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