iPhone app iPad app Android phone app Android tablet app More

Featuring fresh takes and real-time analysis from HuffPost's signature lineup of contributors
Mario Livio

GET UPDATES FROM Mario Livio
 

What Is Science?

Posted: 09/05/2012 4:51 pm


Most people have at least some vague idea of what science is all about. After all, many of the incredible accomplishments that have completely transformed human life in the last few centuries are credited to scientific advancements. Instead of going around the world in 80 days (a feat Jules Verne considered science fiction), we can now do it on passenger airlines in less than 80 hours (even with stops for refueling). Devastating diseases such as smallpox and rinderpest (commonly known as "cattle plague") have been totally eradicated. We have observed galaxies as they were when the universe was less than 4 percent of its current age. Twelve men have walked on the Moon. The Higgs boson -- the fundamental particle that gives mass to all other fundamental particles -- has been discovered. The average human life expectancy has more than doubled since medieval times. The list just goes on and on.

Still, the continuous attempts by various pseudosciences to gain respectability as scientific theories constitute, in my humble opinion, a clear and present danger. To understand the difference between genuine science and pseudoscience, let's examine the ingredients of the scientific method. Ever since the works of such giants in the philosophy of science as Bacon, Descartes, Spinoza, Locke, and Hume, we know that one has to start with a collection of data through experiments or observations (Figs. 1 and 2 show two of the most advanced facilities for collecting such data). In the next step, the scientist formulates a hypothesis that attempts to explain the phenomena that have been observed. Successful hypotheses are those that not only stand up to further testing but make specific predictions that can be tested by new experiments or observations. Of those hypotheses, the ones that concern a multitude of phenomena can mature to become comprehensive theories, and those that are found to universally hold true, independent of place or time, gain the most distinguished status of laws of nature.

2012-09-04-LHC_hall.jpg
Figure 1. The underground tunnel at the Large Hadron Collider (LHC), where the Higgs boson was found.


2012-09-04-web.jpg
Figure 2. Part of the mirror of the upcoming James Webb Space Telescope, which will observe the very first galaxies in the Universe (photo credit: Emmett Given, NASA Marshall).


Over the years, even this carefully constructed paradigm has been subjected to serious philosophical criticism, especially concerning the problem of induction. Induction is the process that leads us from a finite number of observations to such universal conclusions as "all bodies on Earth fall with constant acceleration." Clearly, from a strictly logical perspective, such arguments cannot be rigorously valid -- we have not observed all the bodies on Earth (my high-school teacher used to say, "And if you see a body that does not obey this law, please let me know immediately!"). Philosophers of science have attempted to address the logical problem of induction in two main ways. First, Austrian-born Karl Popper argued that as long as hypotheses are falsifiable, in the sense that experiments or observations exist that would disprove them, science can maintain its objectivity. Popper suggested that a theory should never be considered confirmed, no matter how much evidence has been collected to support it. Rather, we should accept theories until they have been falsified. Note that the key criterion here, distinguishing science from pseudoscience, is falsifiability. Unless a theory is able to make definite predictions that can be checked and shown to be wrong, it cannot be considered scientific. In case you wonder, the theory does not necessarily need to be mathematical in order for it to make clear predictions. Darwin's theory of evolution by natural selection, for instance, predicts a very particular sequence in the geological record. The finding of even one fossil of a modern rabbit in a rock that is 3 billion years old would destroy the entire theory.

A second partial response to the problem of induction is offered by what is known as the Bayesian confirmation theory -- that our trust in theories comes in degrees that can be quantified by the theory of probability. In other words, we should attach high credence only to universal theories that are repeatedly tested and borne out by observations. Bayesian confirmation theory attempted to create what one might call "positive" scientific knowledge, to complement Popper's account for "negative" ones. However, philosophers of science are, by their very nature, a skeptical crowd. Thomas Kuhn and Paul Feyerabend, for instance, argued that our prior theoretical ideas influence which observations we make and what interpretation we attach to them. Others countered that even if it is true that a number of different theories may be compatible with a given body of data, this does not mean that we cannot logically choose among such theories, since typically some would be better supported by the data than others. In conclusion, while it is certainly true that history teaches us that many past scientific theories eventually turned out to be false, even those false but genuinely scientific theories contained a significant element of truth. The bottom line is clear: Science investigates strategies for achieving predictive success, heuristic fruitfulness, and simplicity.

 
 
 

Follow Mario Livio on Twitter: www.twitter.com/Mario_Livio

FOLLOW SCIENCE
Most people have at least some vague idea of what science is all about. After all, many of the incredible accomplishments that have completely transformed human life in the last few centuries are cre...
Most people have at least some vague idea of what science is all about. After all, many of the incredible accomplishments that have completely transformed human life in the last few centuries are cre...
 
 
  • Comments
  • 99
  • Pending Comments
  • 0
  • View FAQ
Comments are closed for this entry
View All
Favorites
Recency  | 
Popularity
photo
HUFFPOST SUPER USER
bccmeteorites
Don't believe everything NASA says.
11:06 PM on 09/08/2012
Still, the continuous attempts by various pseudosciences to gain respectability as scientific theories constitute, in my humble opinion, a clear and present danger.

Examples please.
07:32 AM on 09/09/2012
Hmm... creationism, denial of AGW, denial of Aids as a viral infection, any form of "free energy" come to mind, for starters. The latter is actually more of a business model, though, that wants to extract free money from the feeble-minded.
photo
HUFFPOST SUPER USER
ttsgw
Atheist and secular humanist
01:42 PM on 09/07/2012
The opposite to religion.
This user has chosen to opt out of the Badges program
photo
11:33 AM on 09/07/2012
"Man prefers to believe what he prefers to be true." - Francis Bacon

Given that I'll go with rephrasing Michael Shermer from 'The Believing Brain':

Science is how we tell the difference between what we would like to be
true and what is actually true.
03:35 AM on 09/07/2012
"The Galaxy, Imperialism and Us:

Science-vs.-Oligarchism

[True scientific method, by its deepest nature, is, like Classical poetry and drama, inherently metaphorical in the substance of its most deeply underlying character and meaning. -DP]

This was typified for modern science earlier by the breakthrough in scientific method presented to modern physical science by Cardinal Nicholas of Cusa's De Docta Ignorantia. This tradition of trends in modern science, has been continued again, and, again, during the just concluded century, as, typically, by the most crucial among the discoveries of such exemplars as Max Planck and Albert Einstein, and as greatly amplified by treatments of both life-as-such, and human creativity, by V.I. Vernadsky. This principle of discovery demands that we carry that principle, as in retrospect, over into the related, self-reflexive category of Riemann's treatment of the physics-implication to be considered in the concluding, third section of his habilitation dissertation, without need of much further detailed argument on that subject than is supplied in that document there."

http://tinyurl.com/993fq7k

Subtle point, seemingly... but not really, crucial and very core.
photo
oneeasyrider
E=mc2: From light you exist
10:56 PM on 09/07/2012
Simplify. Recognize Einstein's genius was demonstrated in his ability to unlock complicated natural phenomena in a simple way, with clear reproducible results every mathematician and physicist can test, and which the rest of us can follow with a bit of effort.

"Rather, we should accept theories until they have been falsified." In other words, anything is possible, but you've got to prove it, just like Einstein when he challenged Issac Newton and won.
04:27 PM on 09/08/2012
One should mention, though, that Newton may still be "less wrong" than Einstein. We don't know, yet, which theory has a larger range of validity in terms of its coverage on a logarithmic scale map. It seems that Einstein is winning, though, if recent observations of high energy gamma rays prove that there is no Planck limit.
06:06 PM on 09/06/2012
It is ironic that Mr. Livio raises the topic of evolution. In his example he rightly raises the issue that the theory is falsifiable [3 billion year old modern rabbit fossil], thereby concluding that evolution is science.

However, evolutionists also claim that the earliest form of life was bacteria, which has virtually remeained unchange throughout time. Hence, since modern bacteria are said to be the first form of life, does that not disprove evolution as well as the 3 billion year old rabbit fossil??

And, if a theory is disproven or shown to not be the sole rational for observed phenomenon, does that not also qualify the field of study to be a 'pseudoscience'??

Today, there is so much corruption within those claiming to be scientitsts that it becomes near impossible for a layperson to believe much of anything, which scientists claim to be proof.

The perfect examples of this are the pseudosciences of evolution and man-made global warming -- both treated like they are scientific fact.
03:11 AM on 09/07/2012
"However, evolutionists also claim that the earliest form of life was bacteria, which has virtually remeained unchange throughout time."

Phew... what a relief that science does not actually claim that, at all. There were early single cell life forms that are SIMILAR to modern bacteria. These organism are about as similar to their mothern brethren (biologically speaking) as a rabbit is to Pisanosaurus. Both the rabbit and Pisanosaurus can run and stand on their hind legs... other than that...

"And, if a theory is disproven or shown to not be the sole rational for observed phenomenon.."

If that happens, a theory is replaced by or embedded into a better theory with a wider range of application. Happens all the time. Newtonian mechanics, for instance, can be derived from quantum mechanics, from special relativity, from general relativity as well as from statistical mechanics and from fluid mechanics as a limit of these theories. QM and relativity can not be derived from each other, they are actually mutually exclusive, yet they are perfectly fine theories that can co-exist over all as of now measurable phenomena and all theories come with their limits built in, which explicitely state at what point a different theory or sets of theories are needed. No big deal.

Guss you didn't know that. Happens to a lot of "conservatives".

:-)
09:17 AM on 09/07/2012
Those involved in the evolution religion can discuss the nuances of the similarity of bacteria to ancient bacteria -- perhaps, you all can come up with a single position. No matter what position you come up with, the theory of evolution fails on three fronts.

First, the father of evolution, Darwin, based his conclusions not on the scientifc method, but on the fact that the Church of England's creation account [young earth] did not correlate with his observations/findings.

Second, because each species owes it's existence to the natural selection decisions of its predecessor species and such decisions occur generation after generation, extinction is impossible if evolution is true.

Third, the mass extinction at the end of the Pleistocene makes it impossible for the extent of land life to have speciated and changed genera in less than 14k years according to Darwin's theory.

Regarding the fraud of man-made global warming, as glaciers melted over Greenland, a village dating back to the 1600's was discovered. Hence, the earth, prior to the industrial age, was warmer.

Not a penny of taxpayer money should be wasted on these two pseudosciences.
HUFFPOST SUPER USER
onionboy
Blessed are the Cheese Makers
12:27 PM on 09/07/2012
"However, evolutionists also claim that the earliest form of life was bacteria, which has virtually remeained unchange throughout time. Hence, since modern bacteria are said to be the first form of life, does that not disprove evolution as well as the 3 billion year old rabbit fossil??"

Evolution does not require that every organism MUST change over the long run through time. If their formation is optimal for their particular environment then the small changes generation to generation will eventually just keep their genetic makeup wobbling in about the same place. Change only continues in one direction if it's selected for.

So, there's your lesson.
01:16 PM on 09/07/2012
True -- that is why evolution theory is false. Not all make the same natural selection decisions. A portion of every generation makes similar decisions as the previous generation. And, natural selection is a dumb [unintelligent] process -- not knowing if the decision will survive over time.

For instance, if humans knew there would be a global ice age in a few years, we all would try to mate with Eskimos in order to survive. Yet, most mate with their own race, while a portion of each race mate with those of another race. The same process takes place the succeeding generation.

Let's take for example humans that are half white and half black. In order for that mix breed to become extinct, it would be necessary for all the half bred people to die off. But, in addition, every one in the black and white races would also have to become extinct in order to prevent more natural selection decisions creating the half breed people.

Likewise, every ape, whom evolutionists claim is a predecessor species to humans, would also have to become extinct in order to eliminate any means to make humans. The chain of events goes all the way back to the original form of life.

As one can plainly see, it is impossible for extinction if evolution theory was correct.
photo
HUFFPOST SUPER USER
bccmeteorites
Don't believe everything NASA says.
11:11 PM on 09/08/2012
Evolution does not require that every organism MUST change over the long run through time.

I always thought organisms no matter how complex changed over time to adapt to their changing environment.
This user has chosen to opt out of the Badges program
gutenmorgen
a.k.a. crowsnest
05:59 PM on 09/06/2012
There is no fundamental difference between our science and other animals investigating/testing/probing their environments. Animals do make discoveries and use these to their advantage.
03:14 AM on 09/07/2012
But only very few animals actually teach the lessons of those observations to their offspring. That kind of learning across generations is, as much as I know, limited to humans, a few primates and maybe dolphins and whales. And active, successful theory building is completely restricted to a very small subset of the human population.

:-)
This user has chosen to opt out of the Badges program
gutenmorgen
a.k.a. crowsnest
10:49 AM on 09/07/2012
You may well be correct. I am sure that you know that your thesis presumes that we already know all means of communication of all animals with their offspring under all circumstances.
Genders
Love, Tolerance, Enlightenment
04:41 PM on 09/08/2012
Sure, ordinary people and most life learn from experience.

But they do fall into traps, and superstition.

They have no methods for testing their theories inn a rigorous way.

I have seen cats and dogs become phobic about lines on the floor because once it was a snake.

Random conditioning also creates false theories in humans and animals as well. That is when we get a random pain or pleasure with some condition at the same time, will lead to trying to recreated that condition even when it works only once in a while and has nothing to do with the desired outcome.

So there is a fundamental difference between natural learning and science.
04:06 PM on 09/06/2012
There are two mutually exclusive... views, contexts, means and uses of and for the scientific method.

Exemplified by the way Gottfried Leibniz, first, and then repeatedly exposed both René Descartes, and also John Locke during the 1690s, and later, as inherently, intrinsically... incompetent on matters both mathematics and physical science.

That their axiomatic (replacing mind, with "axiom") ontological presumptions, could be so thoroughly deconstructed by Leibniz... and for them to yet be allowed to re-appear as "giants," is telling.

Also... anything touched by Darwin, by definition, has to be deconstructed and done over, doubtless from the ground up.
06:35 PM on 09/06/2012
Wow... that was a distrubed mind working at a very high level.
12:28 AM on 09/07/2012
Jonathan there are people, versed in the  Leibniz vs Descartes - Locke, history.

You're obviously, not one of them.

Darwin is a joke; the money trail from the British East India Tea Company through Malthus to Darwin is, also, well established. 

Thus, you have neither the qualifications, nor, truth be told... the aptitude, or curiosity to engage anyone, these subjects. 

So, please go inflict your nihilist mediocrity on someone else. 
01:18 AM on 09/07/2012
Yes all the people who didn't ask questions, didn't challenge, explore, or, in actuality think for themselves... probably feel dissed.

...::chuckle::...

So ignorant, so dumbed down... so in love with your chains; you are as funny as you are tragic.

"It's" funny too: I have to put a classical education into the Huffingtonpost word limit.

Or have the nonsense stand.
01:40 AM on 09/07/2012
That was a simple one.

Proven so more than once.

Thus this tack, I spose.
SelfAwarePatterns
seek truth; question everything
01:45 PM on 09/06/2012
An excellent article. I think science begins and ends with empirical evidence. That is, evidence of, or logically derived from, the senses (sight, touch, smell, sound, taste). To be accepted, the evidence also needs to be of a type that can be reproduced or at least verified in some manner by multiple people in whatever field it applies to. Scientific theories are formulated to explain the empirical evidence we now have and can be invalidated or falsified if the wrong kind of empirical evidence is subsequently discovered.

If there is a disagreement between scientists, it will ultimately be settled by more evidence.

Note what is missing. Private revelations, internal feelings, hidden secret data, and other subjective or unverifiable events. When any of these are in the picture, be skeptical. They are usually the signs of pseudoscience, superstition, or con jobs.
HUFFPOST SUPER USER
realitytrumpsbull
Two 'alves of coconut!
10:02 AM on 09/06/2012
Science is the detailed study of various aspects of our world, and has given us things like canned food and cable TV. Thanks to science, humanity now has the theoretical potential to wipe out all life on the planet, in under 30 minutes, pretty much. We can observe what distant galaxies were doing, 80 million years ago, or what our neighbors are doing right now, on wireless webcams. But, science can also be a way to make the public pay for stuff that's maybe kind of questionable, and keep people employed at handsome salaries for the duration of their careers, living in really nice homes, while the public basically starves. One thing science hasn't figured out how to do, is how to get people to stop having legions of children that they themselves cannot support, and with global population now at 7 billion and rising, 'do the math' on that one. That would be a great scientific study, find out one person's average hourly C02 emissions just from breathing x24, x365, x7 billion. NOW you know why the ice caps are melting...
06:34 PM on 09/06/2012
We can wipe out all life in 30 minute? How, exactly, would we do that? Please explain. This scientist does not know of any such method.

"One thing science hasn't figured out how to do, is how to get people to stop having legions of children"

Russia has figured it out. Germany has figured it out. The US has figured it out. Even China has figured it out. Me thinks you are, at least, 50 years behind the curve?

:-)
10:29 PM on 09/06/2012
Life is more resilient than it looks. Wiping all life on earth in 30 mins? Respectfully, I don't think so...
photo
jf12
When I saw her I marveled greatly.
08:24 AM on 09/06/2012
This is easy. Science is what scientists do, and science is what scientists say it is. Just like art.
06:32 PM on 09/06/2012
That's an argument by authority that no scientist would ever accept.

:-)
09:48 AM on 09/07/2012
They might not accept it but it does seem as though that is the way scientists act. The sociology of science does not often match what scientists say they do or why they do it. I am not advocating that is what should be but point out what has been observed.
HUFFPOST SUPER USER
onionboy
Blessed are the Cheese Makers
12:37 PM on 09/07/2012
That's argumentum ad verecundiam...an argument from a position of authority...and it's often what scientists spend decades battling against rather than for.
cosmicdart
paragon of paradigms
03:45 AM on 09/06/2012
Excellent! It comes down to the fact that the Scientific Method has worked better than any other method of acquiring reliable sharable knowledge.
12:44 AM on 09/06/2012
Much better than the last article.

:-)
photo
HUFFPOST SUPER USER
BuddhaStar
08:21 PM on 09/05/2012
Awesome!!!
photo
phal4875
The world is run by cats; we just feed them.
07:01 PM on 09/05/2012
No one will convince me that phrenology is not real. Kidding. Excellent article.