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Priyamvada Natarajan

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How Science Works

Posted: 05/11/2012 12:22 pm

We hear a lot about American children's poor performance in science. But we really ought to be worried about the scientific ignorance of American adults.

Most of our fellow citizens can't describe the structure of the atom. They maintain that humans and other animals have existed in their present form since the beginning of time, and deny evolution. They believe in the efficacy of scientifically unproven medical interventions, such as pills that promise to melt away fat, and the legitimacy of ESP.

Why are Americans so uninformed about science, and so doubtful of solid scientific findings? This mistrust of science is rooted in a misunderstanding of how science works.

Science is evidence based, and provides a continuing understanding of complex natural phenomena. Our understanding is constantly evolving and continually improving.

Evidence based reasoning underpins all scientific thinking and it involves testing hypotheses or theories against data. Validating a theory requires replicable measurements from independent groups with different equipment and methods of analysis. Convergence of evidence is critical to the acceptance of a scientific idea.

Scientific knowledge is by its nature provisional. This is due to the fact that as time goes on, with the invention of better instruments, more data and better data hone our understanding further. Social, cultural, economic and political context are relevant to our understanding of how science works.

Progress in science occurs in fits and starts, and paradigm shifts occur when evidence can be marshaled to support a new point of view. Science is practiced in a climate of inherent uncertainty and the process of verifying a hypothesis or theory is never-ending. Since over time evidence may accumulate to support or falsify a hypothesis, disagreements are essential to the honing of an acceptable theory.

The reality of how science works is in sharp contrast to the way most Americans seem to see it--perhaps as definitive, time-limited, and based on speculation or assertion.

While this misunderstanding of science is a longstanding phenomenon and not new, it has been aggravated by a new development: the scientific process now occurs in the full view of the public at large in this age of information sharing. This has led to a rush to interpret the frictions in what is simply the normal process of contestation prior to acceptance, as evidence that the theory being contested is not valid.

A case in point is the debate over climate change. Scientists do not disagree on the facts or the data but do so in the interpretation. Given the complexity of the climate-modeling problem, it is unsurprising that there are uncertainties -- for instance the best 23 models predict a range in rise of the global mean temperature by anywhere between 1.1 - 6.4 oC by 2100. The major uncertainty hinges on the need to include the future emissions of carbon dioxide into the modeling. While no one disputes the current measurements of carbon dioxide emissions levels in the atmosphere, it's in the estimates of the anticipated growth rate that disagreement lies.

What we see playing out now is a clash of values, differences that arise from our commitments to and the sense of stewardship we as humans feel for the environment today and for the future. This clash of values is real and needs to be confronted but it is apart from the scientific facts.

If American adults don't know the structure of the atom, that's a blot on our national scientific literacy. But if American adults don't understand how vaccines work or how carbon emissions are heating up the earth, we have a catastrophe on our hands.

What do we do about this? Some of this mistrust of science is rooted in the lack of appreciation and first-hand experience of how science works. Part of the blame can be attributed to my community, that of scientists, we have not been very effective in translating and communicating our practices, the results of our research and its implications to the public in clear terms.

Outreach had not been high on our agendas until recently but this is changing rapidly with a large number of scientists writing and engaging more actively in the public sphere. Also we have failed to clearly delineate the nature of scientific explanations in contrast to other kinds of explanations that are not supported by data.

Insufficient communication and engagement, in my opinion has contributed to the lack of understanding of the practice of science and the nature of scientific discovery.

In addition, politicians and policymakers need to explain how they're using scientific evidence to make their decisions.

And last but not the least, we need to improve science education in schools so that we produce a new generation of scientifically literate adults who are able to grapple with, and solve, the big problems confronting us. On this there is near unanimous agreement, for 97 percent of voters in a recent poll making sure American students receive a world-class education in math and science ranked second only to fixing the nation's financial health .

 
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uniqumm
Hot Snark served with relish
12:20 AM on 05/15/2012
"In addition, politicians and policymakers need to explain how they're using scientific evidence to make their decisions."

That's funny!

The numbers of prime interest (pardon the unintentional pun!) to them are the numbers on the bank statements for their re-election campaigns.

Science? That's just a talking point to most of them, to be used, or abused.
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Cole 33
Careful. We don't want to learn from this.
04:49 PM on 05/14/2012
Another problem is that industries that make their money on current science are threatened by new science that may change their industries.

Inventor Ray Kurzweil said that one of the biggest opponents he's faced in the fully electric engine race is the auto industries who have invested for many years in the Science of combustion engines, if tomorrow a fully electric 350 hp engine became available, it would destroy the combustion engine auto industry. They suppress the science while at the same time try to develop it so they can be the first to take the profit from it.
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uniqumm
Hot Snark served with relish
12:22 AM on 05/15/2012
"if tomorrow a fully electric 350 hp engine became available".......

Eh?

I assume you meant something other than what you wrote!
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Cole 33
Careful. We don't want to learn from this.
12:15 PM on 05/15/2012
? Horse power is just a power by pounds per foot measurement. or wattage 1hp is about 740 watts of power. It'll happen at some point, someone will figure out how to make a fully electric engine with a high horse power rating.
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Cole 33
Careful. We don't want to learn from this.
04:44 PM on 05/14/2012
Many people only accept science when it effects their lives, and always reject science when it doesn't

In reality Science does what religion and philosophy have been attempting to do throughout history, which is trying to unify our knowledge about our existence, Science just does a far far better job at doing the unifying and knowledge part.
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uniqumm
Hot Snark served with relish
12:25 AM on 05/15/2012
But a knowledge that the believers don't want to believe because it undermines what they fervently believe without substantiation.
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Cole 33
Careful. We don't want to learn from this.
12:13 PM on 05/15/2012
Well they don't really have a choice, they use indoor plumbing and medicine like everyone else, among many other things.
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02:32 PM on 05/14/2012
I wish it was as simple as that, or as innocent, but I don't honestly think it is. There are psychological motivations at play that are not consciously recognized by the people with the clashing views. There are politics, and money, and self interest, and arrogance too. Science is science, and most people are not scientist.

The problem too is that the problems we face today, i.e. climate change, are really complex problems and I have doubts about the education system's ability to bring kids to the level of understanding needed to make them see the science clearly.

And then we have religion, that apparently excuses every and all behavior as long as you "Accept Christ", and seems to teach that this world doesn't matter but the "next" one does. If you believe something like this, how on Earth will anyone convince you to take stewardship seriously?
01:39 PM on 05/14/2012
'replicable measurements from independent groups ........................convergence of evidence' This is the difficulty.Religfions like Christianity do not require this convergence. All that is necessary is a commitment to a belief. The walking on water of the Savior cannot be replicated but this is irrelevant, as is the origin of man to the record of the rocks.. The science community ought to unite (that will be the day!) in repudiating the major religions because these are inimical to the acceptance of the laws of nature. Teach Archimedes Principle on Friday and Matthew 14 25-26 the following Sunday and you cause confusion and maybe a bipolar persona.
01:37 PM on 05/14/2012
So if I believe in evolution I'm going to live 80 or so years with no hope of anything afterwards. And if I believe in God I'm going to live 80 or so years with a hope for something further. Guess I'll take the latter.
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Cole 33
Careful. We don't want to learn from this.
04:37 PM on 05/14/2012
No it's goes like this. If you believe in evolution it's not going to change how long you live or what happens after you die, if you believe in god it's not going to change how long you live or what happens after you die.
10:09 PM on 05/14/2012
sorry but that's where i have a hope and you don't.
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uniqumm
Hot Snark served with relish
12:28 AM on 05/15/2012
I don't think they get it!

Too complex!
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democratbob
Equality for all, including marriage.
05:02 PM on 05/14/2012
People don't believe in evolution; they accept it as the best explanation for the unity and diversity of life on this planet. There is nothing to believe in; it is not a philosophy or a way of life. And there are many religious people who fully accept evolution, and they still believe that there is life after death. I personally don't and many religious people also do not believe in anything after death. I try to live my life in the way that does the least harm and the most good for the most people, especially those I love. If I accomplish that, I'll have lived a good life and deserve to be remembered well and fondly.
10:21 PM on 05/14/2012
You're correct, they don't believe in evolution, it's a theory and therefore they must have faith in the scientists that expound it. There may be religious people that accept evolution; being religious in itself does not make one a Christian or one who accepts the Bible as God's word. If you believe in evolution you deny Christ, God and the Bible. What really concerns me is that you have to justify yourself by your last two sentences. Bob, I don't care what you believe in, that in no way makes me think you or anyone else who accepts evolution is somehow a lesser person. I just choose to have a hope and like you do the best I can. Let's not be among those who condemn one another for choosing to believe differently.
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Dan Jighter
07:59 AM on 05/14/2012
Science is just like first hand experience but better. Science provides a careful and precise methodology for testing opinions. It is designed to not only observe things but to carefully and correct analyze the data and double check if you are fooling yourself. Yes, science is tentative, but it is far more reliable than your first hand experience knowledge and what it claims really is facts.

Also, it should be said how science changes. The long established scientific theories -- Newtonian mechanics, quantum mechanics, evolution, molecular chemistry, etc -- are not going anywhere. Where science has controversy is on the frontier, where we are still collecting data and trying to understand what is going on. Things like evolution are no controversial, they are solid facts. What tends to happen in scientists study things they don't understand. There is a healthy debate and attempt to study the phenomenon where scientists make claims, argue, change their minds, etc. Once they figure out something and have a large body of long standing supporting data, then they have facts. Moreover, in studying new situations, we gain a deeper understanding of the world. Newtonian mechanics, under certain hypothesis within certain error tolerances, is correct. But there is more to the story like quantum mechanics. Science is changing but it isn't like scientists are clueless nerds that don't know anything. Science does in a very useful and satisfying sense give us facts.
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uniqumm
Hot Snark served with relish
12:30 AM on 05/15/2012
Eyes probably glazed over halfway through your post.
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Dan Jighter
04:18 AM on 05/15/2012
Listen, my comment isn't rocket science. I know I'm no poet, but if you can't have the patience to read such a simple 250 word comment, how can you ever expect to know anything? Seriously, you are never going to understand science or history or political issues or anything that way. If you couldn't read through that comment, please stop voting.

Nothing ever worth knowing came in a quick soundbite or 1 minute explanation.

It's very simple, science is more reliable than your BS first hand experience. Science changes, but only really at the frontier. What science knows, such as evolution, is not controversial, it is fact. The frontier is where the controversy is at. Now, there's your soundbites. It takes more time to then explain why that is. Get over your ADD.
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pshakkottai
retired engineer
11:19 PM on 05/16/2012
In science theory does not mean "hunch". Theory is a name given to tested and proven findings as in theory of quantum mechanics, theory of relativity, theory of evolution, theory of gravitation, kinetic theory etc.
03:30 AM on 05/14/2012
Thanks for a lucid account of something that is plaguing the public awareness (and the financial/political response in consequence) of advances in science not only in the USA, but also in Europe and particularly badly in developing countries.
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methodman
01:31 AM on 05/14/2012
The people who hold disdain for science won't read any of it so they make claims things are not understandable. No one can win over the resolve to not evolve crowd Just invest in things you know about science. Buy a Radio shack kit. Subscribe to Safari Books online, Try to get a library card from a college near you, Subscribe to Questia because I have no libraries I can access. Our local county library does not carry many university books. Play I'm blinding you with science for a religious person 2 times a week by using rhapsody. It gets them away from me and I am free to draw alternatives to Marvel Comic characters off of a digital subscription. I have access to many journals this way and limit my TV time deliberately. Science is an investment that does pay off maybe not in a conversational way but in a satisfaction way.
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Ronald Malaney
01:25 AM on 05/14/2012
I now know where the term mad scientist come from, after reading 50 or so post. no experiments or peer review needed.
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SonOfUgh
Your micro-bio is empty
02:34 AM on 05/14/2012
An online forum, such as this, is not a scientific journal. There is no need for experiments or peer review as these user posts are what science (and the law) would call low quality information. They are opinions. True science is done by careful experimentation and validation of results. It is published in peer reviewed journals. The "mad scientist" stereotype is absurd - insanity amongst scientists is no more prevalent than insanity amongst other professions that attract similar intelligence practitioners.
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Ronald Malaney
02:50 AM on 05/14/2012
dude I was just kidding around, at first anyways now I'm not so sure.
I have concluded 90% of people are not sane.
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Ronald Malaney
02:58 AM on 05/14/2012
I meant mad as in angry, and I think you might be just itsy bitsy annoyed at me.
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methodman
01:19 AM on 05/14/2012
I think Americans refuse to research the different varieties of reason. Science is language and model based and testing all of which are explained well outside of the TV world and stay out of churches they rot the mind.
BlackbirdHighway
Brawndo's got electrolites!
10:30 PM on 05/13/2012
People do seem to not understand basic physics. I've noticed when driving that people seem to think that following my car very closely will somehow make the 15 cars ahead of me go faster. It has never worked, but they keep trying it just about every day.
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SonOfUgh
Your micro-bio is empty
02:35 AM on 05/14/2012
I long ago gave up on following close behind a car to make them go faster. I now realise that the way to make rush hour traffic move quicker is to honk my horn repeatedly and for lengthy durations.
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uniqumm
Hot Snark served with relish
12:37 AM on 05/15/2012
The recommended response is to decrease YOUR speed. That way, if they hit you, the speed is reduction decreases the danger.

Yep!
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doubleB
02:15 PM on 05/13/2012
This should be required reading by every literate citizen.

It never ceases to amaze me the outright arrogance a lot of people have, in regards to science. If you don't practice this stuff every day for your job, aren't able to bounce your ideas off peers in the field, don't have the resources at your disposal to conduct research... how can you possibly expect to know better than the people that do? There's really no other way to describe it, other than arrogance. With a nation of C-average science students, 99% of whom don't do this stuff for their jobs... it strikes me as outright suicide that we treat the scientific community with such disregard. I'm not a religious person at all... but we will absolutely reap what we sow.
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uniqumm
Hot Snark served with relish
12:41 AM on 05/15/2012
Ohhhhhh....... Will we ever!

Seven billion..............eight billion........
.....................................................................nine billion.......

.................I don't think we'll make it much past nine billion - then................

.............................................................................!
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01:50 PM on 05/13/2012
You explained well the part I think that so many people misunderstand. And that is that science is an iterative process. The point is discovery and to reach conclusions based upon knowledge at any point in time. But it should not be the case the need to say with finality that "this is the way it is".

Because when new evidence arises, the earlier conclusions need to be modified to comport with the new evidence. This drives people who have a need for certainty nuts. They then attack science and scientists, saying, "See science and what scientists do is all bogus baloney". The problem is those people's misunderstanding, and their need for certainty -- not science.

For many things, the conclusion may very well be the way it is (the sun rises in the east and sets in the west). As long as the conclusions work for us because we never see any conflicting anomalies, that's what counts. Beyond that, nothing is gained by closing our minds, insisting upon finality. All that does is apply dogma to science; and that shuts down pursuit of new discovery.
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pshakkottai
retired engineer
11:26 PM on 05/16/2012
Re: "Because when new evidence arises, the earlier conclusions need to be modified to comport with the new evidence." Not really. The new theory must also explain the old facts. For example, quantum theory explains very small scale phenomena but in the limit of large masses reverts to Newtonian mechanics. It is a requirement for a new theory.
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11:24 AM on 05/13/2012
The real secret of science is that the world is made of words, and that if you know the words that the world is made of you can make of it whatever you wish.
03:22 PM on 05/13/2012
You obviously do not know the right words.
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01:03 AM on 05/17/2012
Your right perhaps Bobo the Clown would though, eh?
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Sjoerd W
Always look for common ground.
03:54 PM on 05/13/2012
That doesn't make any sense at all. Are you on something?

Words are a human invention, with the purpose of describing the world and what it's made of. You can change the word, but the thing it describes doesn't change. A rock is still a hard piece of a certain material, even if you call it a tree.
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09:14 PM on 05/15/2012
I was quoting a great philosopher. You clearly didn't get the memo.