But You're Not A Scientist!

In recent discussions with evolution deniers, quite often I've been told two things.  One is that I'm not a scientist so how would I know what I'm talking about and the other is that I have to take a scientist's word on faith.  At first glance, these seem like reasonable statements, however, when you slow them down and look at them more closely, you will find that they aren't so accurate.

Let's first look at the fact that I am not a scientist.  The definition of scientist is as follows:

"A person engaging in a systematic activity to acquire knowledge that describes and predicts the natural world. In a more restricted sense, a scientist may refer to an individual who uses the scientific method."

Now let's look at the definition of expert:

"A person who is very knowledgeable about or skillful in a particular area."

A scientist is a person who acquires knowledge and an expert is a person who learns about and understands the information acquired by the scientist.  We aren't all scientists.  It takes scientists to figure out how to design a working helicopter, but it takes an expert engineer to build one and an expert aviator to fly one.  Most helicopter pilots would be unable to build one and most helicopter engineers would be unable to fly one.  Then there are scientists who not only figure out how to build better helicopters, but can also engineer and fly them.  Having said this, you don't necessarily have to even be an expert to fly one.  Every pilot has to start somewhere, right?

For over 150 years, scientists have been studying and acquiring knowledge that contributes to the continually developing theory of evolution.  These scientists have provided the information and all we need to do is learn this information.  A person who studies a particular topic, such as the theory of evolution, is usually an expert compared to those who don't understand it at all.  If you are unsure about someone's expertise on a particular topic, just check their claims by going back to the original source of information provided by the scientists.

Let's look at the second claim made about me.  I have to take a scientist's word on faith.  The two definitions of faith are as follows:

1. "Complete trust or confidence in someone or something."
2. "Strong belief in the doctrines of a religion, based on spiritual conviction rather than proof."

Usually, when someone accuses you of accepting a scientist's word on faith (yes, this is an accusation), they are using a logical fallacy called false equivocation.  This means they are using one definition of a word that doesn't match the context in which that word is being used.  In this case, the accuser is using the second definition of the word faith which is belief without evidence rather than the correct definition which is trust or confidence in the scientist.

Now even using the correct definition can cause reason to doubt considering the fact that it's possible to trust someone who is wrong, but trusting a scientist's word doesn't by necessity have to be by belief without evidence.  Trusting a scientist can and should be based on looking at the evidence presented.

Bill Nye is often ridiculed by doubters for not being a scientist.  As I've demonstrated, there's a difference between being scientist and being an expert.  You don't need a PhD in physics to pilot a helicopter.  You don't need a PhD in biology, paleontology, geology, zoology, chemistry, molecular biology, taxonomy, mathematics, cosmology, physics, probability, anthropology, archaeology, history or philosophy to learn about and be an expert among your peers on how evolution works.

Is There One Piece Of Evidence That Proves Evolution?

Time and time again I've had people say to me, "Show me one piece of evidence that proves evolution to be true."  What an annoying request.  It's a silly request.  It's like saying, "Show me one piece of evidence that proves agriculture to be true."  Where do you start?  Is there one stand-alone example capable of proving agriculture?  No, and one of the reasons that evolution deniers make this ridiculous demand is because they don't understand (nor want to know) what the word theory means in science.

In everyday language, theory most commonly means hypothesis, or an idea that hasn't been tested.  For example, if I found a broken glass on the kitchen floor, in answer to what happened, I could say my theory is that the four year old running around the house knocked it off the counter top.  This seems perfectly reasonable since she's knocked over other things during the course of the day.  But that is only a hypothesis and looking back through the security footage, I would find that it was in fact the cat that broke the glass.  So you see, theory in this sense is just a baseless hypothesis, or educated guess that is prone to inaccuracy.

In the scientific community, theory has an entirely different meaning.  While laypersons use the word theory to cover multiple meanings, the scientists use less ambiguous language - hypothesis, theory and law.  Hypothesis is an idea that needs to be tested and proven.  Theory is an explanation of how a particular area of science works.  Law is a statement of fact.  If a scientific law is ever proven to fail, it ceases to be law.  A scientific theory is usually continually being developed and refined.  You may hear people say that theories are always changing so you can't trust them, but that is a dishonest statement.

When a new scientific discovery is made, it adds to the relative theory, usally filling in gaps or adjusting a small part to a more accurate explanation.  Change in a scientific theory does not mean the entire theory is thrown out and replaced with another theory, which is what evolution-deniers would like you to believe.  The same goes for the claim that science is always changing its mind.  No, science is always being refined and added to.

Let's look at some other applications of the word theory in science.  We have gravitational theory.  It doesn't mean we're guessing that there is gravity (although flat earth believers would make that claim), it is an explanation of how gravity works, how it behaves, etc.  We have germ theory.  It doesn't mean we're guessing that there are germs, it is an explanation of how germs behave, how they evolve, how they affect other animals, etc.  We have music theory.  It doesn't mean we're guessing that music exists, it is an explanation of how different frequencies of sound are produced, behave, interract, etc.  And then we have evolutionary theory.  It doesn't mean that we're guessing that evolution happened, it is an explanation of how biological life evolved, how natural selection works, etc.

So going back to one peice of evidence that proves evolution, the reason we can't provide once piece of evidence is because the theory of evolution is a thorough explanation of the diversity of life.  It covers many fields, such as biology, molecular biology, chemistry, paleontology, taxonimy, zoology, and so forth.  Just as I can't give you once piece of a puzzle to prove the puzzle is a picture of a tiger, I can't give you one piece of evidence to prove the theory of evolution to be fact because the entire theory of evolution can't be proven with one piece of evidence alone.