The Scientific Method
The natural sciences are one of
humankind's great achievements. In popular culture to hear that something is
'scientifically proven’ is almost the same thing as hearing that it is
'definitely true' and science has certainly achieved many wonderful and
terrible, advances in recent history. In a search for reliable knowledge,
science must rank high on any list. After all, we trust scientific beliefs with
our lives every time we get in a car or aeroplane use a lift or eat processed
foods. So what is it about the natural sciences that make them so special?
The Scientific Method
Observation, reason, and
experiment make up what we call the scientific method. Thus the
basic outline of the scientific method looks like this.
It is also very important that the
observations, reasoning, and experiments can be repeated and checked
independently by other observers. If you and your friends are the only ones to
have seen or understood something, then it doesn't count as science. Your
sighting of a UFO last year is not likely to be accepted by scientists. If the
UFO had really been there, radar equipment would have picked it up, and it
would have been reported. Your report has not received independent experimental
confirmation where there should have been, so your claim is not scientific.
That is not to say that it is definitely false, just that it is highly likely
to be false.
Science also needs a little
imagination
But science isn’t just a method
alone. It usually needs a little imagination to set it going. Imagine living at
a time when everyone believed that the Earth was flat. This belief actually
makes a lot of sense when you just look at the world, after all, with the
exception of a few mountains and valleys it certainly looks flat and we’re
certainly not sliding off it. So at this stage, thinking that the Earth was
flat was in fact a reasonable scientific belief. Here we have the first
indication that science and truth are not always the same thing.
However, in order for people to
realise that the world was not flat some new experimental evidence, some
imagination and a little bit of inspiration was needed. People went sailing and
no edge to the Earth was ever found (this is the new experimental evidence). On
the contrary, there were strange reports of sightings of similar land found by
sailing east and sailing west (more new evidence). So someone used some
inspired imagination and made a bold suggestion: suppose that the Earth is
round.
Now what? We need to test this claim
experimentally and happily some potentially suicidal adventurers were only to
willing to oblige: sailing off round the world they found that you could in
fact circumnavigate it and get all the way back to where you started. So the
Earth, it seems, is round.
Proving it right or failing to prove
it wrong?
However, this conclusion is
premature. Just because you can sail round it that doesn’t mean that the Earth
is actually round it could be that the Earth isn't a sphere but an egg shape,
and on the basis of theory and evidence so far discussed we can't be sure.
This is the essence of scientific truth:
it can never be proven experimentally that a claim is correct. All we can ever
do for certain is try to prove that it’s wrong, i.e. by trying to sail around
the world and falling off the edge. It’s important (and slightly strange at
first) to realise that science doesn’t attempt to prove things right; in a
back-to-front kind of way it actually attempts to prove things wrong and hope
that it fails. Knowing that we haven’t been proved wrong yet is the closest
thing that you can get to being right in science. This approach to science is
called falsification, because you attempt to prove things false
but hope you fail. The longer a theory has been around the more likely it is to
be true … but you can never be sure that you’ve actually got it right: the experiment
that proves that theory wrong could be just around the corner.
The idea of falsification is an
important one and in fact is used by some to determine whether an idea is
scientific or not. If it can’t be falsified, it’s not science!
Remember that to say that a claim is
not scientific does not mean that it is not important. As the physicist Richard
Feynman says: ‘If a thing is not a science, it is not necessarily bad. For
example, love is not a science.’ So, if
something is said not to be a science, it does not mean that there is something
wrong with it; it just means that it is not a science.
Nicholas Alchin - Theory of
Knowledge pp 17- 19