which is the fastest cominication in the world today,among all cominications

Greetings Poptee:

If you are speaking of the fastest medium of man-made communication
then the Internet reigns supreme:

"The Internet continues to be the fastest communication medium in the
world, therefore there are huge business opportunities in the
Information Communication Technology (ICT) sector that even the
smaller business can benefit from."
From a news story at
http://www.bit.gov.bn/archives/press/2002/july/internet_still_the_fastest_way.htm

The use of fiber optics is what makes the communication so fast these
days.  The site at http://www.aboutfiberoptics.com/articles/showarticle.cfm?id=40&topbar=afo-main.htm
explains:

"Fiber Optic (also spelled Fibre Optic) technology is a cutting edge
method of sending and receiving information over great distances (150
km without using a repeater) using light as the data's carrier. The
signal cannot be disrupted by outside sources like electricity, rain,
humidity, or other things that tend to damage conventional copper wire
signals."

The article goes on to state that that fiber optic cables are made of
glass, silica Fiber, or plastic and that glass is used exclusively for
sending data-streams over long distances.

From the same site on a different page at
http://www.aboutfiberoptics.com/articles/showarticle.cfm?id=17&topbar=afo-main.htm
it is stated:

"Fiber optic communications is different from any other data
transmission method, in that it does not use electricity through a
conductor to transmit information. Instead of electrical signals,
modulated light is used to quickly transmit data over long distances
through an insulated glass fiber-type material. Fiber optics is
currently the best long distance communications method because it
provides much faster data transfer speeds when compared to traditional
interconnection media such as copper wire."

**********

However, even communications systems invented by humans can't match
the speed of the human brain and its neurotransmissions.  So, if you
are speaking of the fastest physiological communication, that would be
the brain:

"The Brain & Nervous Systems video presents students with the amazing
facts about the different parts of the brain and how they work in
tandem with the nervous system to create the fastest communication
network on earth."
From http://www.sunburst.com/company/press/press.cfm?press=0802_sb_rws

There's a great series about how the human brain works located at
http://www.howstuffworks.com/brain.htm

"Ask A Scientist" someone asked the question "In terms of megahertz,
how fast does the human brain operate?"  The scientist, Brian Lintz,
answered:

"A human brain is much faster than a super computer at something like
visual recognition. It is much slower at math than a hand calculator
because it is built differently.  Neural Network research is starting
to look at how the brain works.  One of the big differences is that on
a typical computer with linear processors, those processors do one
thing at a time. This allows you to count how much it does in a
second.  A typical PC has one processor and a lot of memory.  A
typical brain has billions of processors (neurons) and probably very
limited formal memory."

So the brain is the fastest multi-processer but its computational
characteristics are limited.

Wired Magazine has a wonderful article about high-tech brain mapping
at http://www.texastech.edu/news/vistasmag/Vistas2001_9_2/Stories2001_9_2/Wired.htm
and see the article from Stanford University "Directing Traffic in the
Brain" at http://mednews.stanford.edu/news_releases_html/1998/augreleases/brainflo.html
to understand more.

*********

Since your question was general, I have offered two different
definitions of "fastest communication."  However, should you require
clarification of any of the links or information I have provided,
please request it before rating my answer and I will be happy to
respond.  The Clarification feature enables a customer and Researcher
to continue dialogue on the fine points after a question is answered.


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I'm sorry, but in my humble oppinion, the part(s) of the above answer
that state such things as "[...] communications systems invented by
humans can't match the speed of the human brain and its
neurotransmissions." is, if not completly wrong, then at least
misleading in some very important aspects:

The nervecells (aka "neurons") of the brain communicate in part by
electric potential and in part by chemical reactions. Both of these
processes are, in comparison with the abovementioned "communication
systems invented by humans" (ie. fiber optics or indeed even plain
electrical wires) very, very sloooow, in fact even the electrical part
of the inter-neuron communication process is much, much slower than
the kind of electrical communication we know from our internet- and
telephone lines, due to the special way neurons utilize the electric
potential.

Add to this the fact that any given neuron need to take a break after
each individual "transmission", and you end with something in the
order of 100-200 milliseconds between each "bit" or "message" sent
from one neuron to another (also the time will increase radically if
the distance involved isn't neglible).

Compared to a vanilla telephone wire, capable of transmitting in the
vicinity of 10 million "bits" in the same period of time, it can
hardly be said that neurotransmissions are fast, certainly not
anywhere near as fast as most technological methods for communication
(fiber optics being even faster than cobber wire, and getting faster
all the time!)

The reason for the brain seemingly being so fast is (at least) two fold:


1.) When the brain performs its various tasks, it does so by using
billions of neurons at once. While each of these may be somewhat slow
(and quite primitive in functionality as well), working together they
not only gain incredible speed (of computation, if not communication)
but they also become capable of performing those complex tasks that
makes the brain such a wonderful mechanism. (Note that the neurons in
the human brain differs little from those in the brain of a mouse or a
whale, ours are just hooked up more "efficiently", allowing us to do
so much more, even if our brains are tiny compared to that of a
whale.)

You will notice that there is a tendency for our brains to "choke" on
very "linear" or "serial" problems (such as calculating), problems at
which our present computers excel at (after all most computers operate
in a mostly linear way, doing one simple thing after the other). On
the other hand we have no problem recognising a partly obscured, badly
lit, face we might have seen only once before, a task that requires
the coordination and execution of a multitude of different sub-tasks
all at once, something we have yet to get our computers to do
efficiently. These examples just goes to show that our "parallel
brains" are good at parallel tasks, whereas a primitive pocket
calculator has the advantage when the task is of a more serial nature
(allowing it to exploit the abovementioned thousandfold speed
advantage of electronics and optics over neurons and
neurotransmittors).


2.) In the sentence above, the operative word is "seemingly", as
studies have shown that our brains aren't nearly as fast as most of us
likes to imagine (again, "imagine" is the key word). In fact it would
appear that the more primitive (and thus faster) unconsious part of
the brain activly "fools" our consiousness into thinking it is "up to
date" and "living in the moment", while the truth is that most of the
time it is something like half a second behind reality!!! You may ask
how come we never notice this (after all you hit the baseball when it
gets to your bat, not .5 seconds later, right), the somewhat strange
answer to this (which I'm not really qualified to explain in detail)
has to do with our unconsiousness "tagging" events as they happen, and
then "serving" them to our consiousness in such a way as to maintain
the illusion that we were aware said events as they happend, when in
fact we weren't (at the time).

This is one reason why you have to practice batting again and again,
until it becomes something like a reflex; since reflexes are handled
by the unconsious part of the brain, you will then be able to hit the
ball, even if your consiousness only learns about it half a second
later! While this might sound quite farfetched, I assure you that
serious experiments have been undertaken, prooving this as well as
determining the precise lag between something is sensed by the nervous
system and the consious brain becomming aware of it.


I hope this errata doesn't detract from your opinion of the brain,
still the most complex machine known to man and capable of so much
more than our (by comparison) primitive computers and optic phone
wires.