The Error of The Evolution of Species - Harun Yahya
The Error of The Evolution of Species
The Micro- and Macro-Evolution Errors
Theodosius
Dobzhhansky
As you see, the science of genetics has revealed that the variations
that Darwin imagined accounted for the origin of species in fact bear
no such significance.
Therefore, evolutionist biologists have been forced to distinguish between
variation within species and the formation of new species, and to advance
two separate concepts regarding them. They gave the name micro-evolution
to variation within species, and defined the formation of entirely new
species as macro-evolution.
The concept of macro-evolution was first used in 1927 by the Russian
biologist Juri'i Filipchenko.184 The idea that micro-evolution could
be used as evidence for macro-evolution was proposed by a student of
Filipchenko's, Theodosius Dobzhansky, in the 1930s. In his book Genetics
and The Origin of Species, one of the basic texts of Darwinism, Dobzhansky
suggested that the mechanisms of micro- and macro-evolution were the
one and the same.185 This view received wide acceptance from evolutionist
circles and has survived down to the present day. Richard Goldschmidt,
a Berkeley University geneticist during those years, expressed the erroneous
nature of this view: "The facts of microevolution do not suffice for
an understanding of macroevolution."186 In fact, what Goldschmidt referred
to as micro-evolution was nothing more than variations within species.
We
frequently see examples of biological variations in our daily
lives. All such instances of variations are simply fluctuations
that occur within specific genetic bounds and that have nothing
at all to do with evolution.
These two concepts have long appeared in biology textbooks, where a
deceptive style is often used. The examples of variation that evolutionist
biologists describe as micro-evolution actually have nothing whatsoever
to do with the theory of evolution. That's because the theory of evolution
maintains that living things can acquire new genetic information through
the mechanisms of mutation and natural selection. But as we have already
seen, variations can never give rise to any new genetic information and
therefore, cannot lead to evolution. Referring to variations as micro-evolution
reflects an ideological preference on the part of evolutionist biologists.
The variations that they deliberately refer to as micro-evolution are
a simple biological phenomenon, examples of which we encounter frequently
in daily life. (Think of all the varieties of cats, dogs, apples, tomatoes,
plants and animals you have ever seen.) Macro-evolution, on the other
hand, refers to major changes such as that of a dinosaur into a bird,
or a bear into a whale. In other words, there is no difference between
the claims of macro-evolution and fairy tales in which a frog transforms
into a prince.
By using the concept of macro-evolution, evolutionist biologists seek
to give the impression that is variations can give rise to brand new
living species—and even genera—over the course of time. Indeed,
many people who lack a sound knowledge of the subject are taken in by
the superficial idea that micro-evolution can become macro-evolution
in the long term. One can see many examples of this thinking. Some amateur
evolutionists suggest that since the average height of human beings has
increased by 2 centimeters (0.78 of an inch) over just the last century,
that means that all kinds of evolution can occur over millions of years.
But the fact is, as we have already seen, all variations such as increases
in stature take place within specific genetic bounds and have nothing
to do with evolution.
In fact, even contemporary evolutionist authorities accept that the
variations described as micro-evolution cannot give rise to new living
classes, or lead to macro-evolution. In a 1996 paper published in the
journal Developmental Biology, the evolutionist biologists Scott Gilbert,
John Opitz and Rudolf Raff stated that:
There
is no difference between Darwinist claims about "macro-evolution" and
fairy tales in which frogs turn into princes..
The Modern Synthesis is a remarkable achievement. However, starting
in the 1970s, many biologists began questioning its adequacy in explaining
evolution. Genetics might be adequate for explaining microevolution,
but micro-evolutionary changes in gene frequency were not seen as able
to turn a reptile into a mammal or to convert a fish into an amphibian.
Microevolution looks at adaptations that concern only the survival of
the fittest, not the arrival of the fittest. As Goodwin (1995) points
out, "the origin of species—Darwin's problem—remains unsolved.187
That the variations known as micro-evolution cannot account for the
claim of macro-evolution, and cannot explain the origin of species, is
also admitted by other evolutionist biologists. The well-known evolutionist
paleontologist Roger Lewin set out his conclusion at a four-day symposium
attended by 150 evolutionists at the Chicago Museum of Natural History
in November 1980:
The central question of the Chicago conference was whether the mechanisms
underlying microevolution can be extrapolated to explain the phenomena
of macroevolution ... The answer can be given as a clear, No. 188
The evolutionist biologists Fagerstrom, Schuster and Szathmary stated
the same thing in an article published in Science magazine in 1996:
Major transitions in evolution—such as the origin of life, the
emergence of eukaryotic cells, and the origin of the human capacity for
language, to name but a few—could not be farther away from an equilibrium.
Also, they cannot be described satisfactorily by established models of
microevolution. 189
In short, micro-evolution is a biological phenomenon, and macro-evolution
is an unscientific dogma—two entirely distinct concepts. Nonetheless,
many evolutionists still believe that these two concepts are one and
the same thing, and that micro-evolutionary changes can turn into macro-evolutionary
ones over long periods of time.190
Other scientists, however, are aware that such a claim totally conflicts
with the picture revealed by scientific findings and the fossil record.
Douglas Erwin, from the American Museum of Natural History emphasized
this in a paper that appeared in the journal Evolution and Development
in 2000.191 According to the American biologists Douglas Erwin and James
Valentine, to account for the origin of new physical characteristics
with micro-evolutionary changes that are in fact nothing more than variations
within species is incompatible with the available evidence.192
The fact is, macro-evolution has never been observed. There is no explanation
compatible with reason, logic and science as to how this might take place.
Professor of Microbiology Carl Woese expresses his view on the subject: "[T]he
term ‘macroevolution' serves more to hide our ignorance than symbolize
our understanding."193
Consider the subjects depicted by evolutionists as concrete and observed
instances of Darwinism, which they put forward at every opportunity as
fundamental proofs of evolution. The Galapagos finches, the Industrial
Revolution moths, bacterial resistance to antibiotics, and insects' resistance
to DDT immediately come to mind, but it is absolutely misleading to portray
these as evidence of evolution. These cases are cases of variations,
or micro-evolution, that present no evidence for evolution. The Galapagos
finches and the Industrial Revolution moths will be discussed later in
this book, where we make it clear that these life forms constitute no
evidence for the theory of evolution. (For biological resistance to poisons,
see Darwinism Refuted by Harun Yahya, New Delhi: Goodword Books, 2002.)
The Speciation Deception
Evolutionists maintain that the first single-celled organism emerged
billions of years ago from inorganic substances, and that the glorious
diversity of life on Earth, emerged over the course of hundreds of millions
of years. Note that according to the Darwinist claim, millions of species
formed from one single species under the influence of natural processes
and coincidence. As this irrational and unscientific claim shows, the
formation of species—that is, speciation—represents the basis
of the theory of evolution. It is particularly clear that a claim not
based on concrete evidence, observations and scientific research is of
no value at all. Darwinism's claim that one species turned into millions
of other species is a huge one that requires countless amounts of evidence
and findings. In fact, though, there is not a single piece of scientific
evidence for evolutionists' claims regarding speciation ever since the
time of Darwin, evolutionists have produced a conceptual confusion and
depict variations as evidence for speciation.
First let's consider the concept of species to get a better understanding
of the evolutionist deception. Descriptions have been produced by various
experts from different biological fields. As put by Troy Wood and Loren
Rieseberg of Indiana University, "Evolutionary biologists have proposed
a diverse, almost innumerable list of species concepts…"194
Biologist John Endler explains the complication as follows:
Species are "tools that are fashioned for characterizing organic diversity" (Lewin,1979).
Just as there are a variety of chisels made for different purposes, different
species concepts are best for different purposes; and just as it is inadvisable
to use a carving chisel to cut a mortise, problems arise when one species
concept is used when it is inappropriate. Confusion and controversy have
often resulted because different people working with different groups
of organisms mean different things by "species."195
Ali Demirsoy, one of Turkey's most prominent exponents of Darwinism,
expresses the truth of the matter this way:
The question of by what bounds the species, the basic unit in the classification
of plants and animals, should be separated from other species—in
other words, "Species Definition"— is one of the most difficult
for biology to answer. It appears impossible in the present state of
our knowledge to give a definition of the species that applies to all
plant and animal groups.196
We
often commonly refer to various members of a class or order as
one single species—when these are actually a considerable
number of species with subtle differences to distinguish them.
For example, some 34,000 species of spider have been identified,
but in daily life we describe most of them simply as "spiders.".
Mention the word species, and most people will think of life forms such
as dogs, horses, spiders, dolphins, wheat or apples. However, biologists
define the concept of species in a rather different way. In modern-day
biology, a living species in the most general sense consists of a population
of individuals able to mate and reproduce with one another. This definition
divides life forms that we generally speak of as if they were one single
species into a number of different ones. For example, some 34,000 species
of spiders have been described.197
To better understand the evolution deception regarding speciation, we
first need to define geographic isolation. Within any living species,
there will be differences stemming from genetic variation. If geographical
obstacles such as a mountain chain or river arise between individuals
of a species, and if they become isolated from one another, then in all
likelihood, within these two separated groups, different variations will
begin to dominate.198
Assume that in one group (variation A), darker skin and longer fur begin
to predominate; and that another group (variation B) has shorter fur
and lighter color. The longer the two populations remain separated from
one another, the sharper variations A and B will become.199 Variations
like these, with clear morphological differences despite their belonging
to the same species, are known as subspecies.
At this point, the speciation claim enters the picture. Sometimes, after
variations A and B have split away from one another due to geographic
isolation and are brought back together again, their members are unable
to interbreed with one another. Since they cannot mate, they cease being
subspecies, according to the biological definition, and become separate
species. This is known as speciation.
Evolutionists take this concept and extrapolate it "Look! There is speciation
in nature. In other words, new species emerge through natural mechanisms.
So all species must have come into being in this same way." In fact,
however, a serious deception is being perpetrated here, because important
points are being overlooked or ignored:
1) Variations A and B, after being isolated from one another, may be
unable to mate when reunited again. Yet this phenomenon generally stems
from mating behavior. In other words, individuals belonging to variations
A and B regard each other as foreigners by the other, and thus feel no
inclination to mate with others that they perceive as different—even
thouigh there is no genetic incompatibility to prevent it. In terms of
genetic information, they all remain members of the same species. (For
this very reason, the concept of species remains a subject of debate
in biology.)
2) The really important factor is that this speciation means a loss
of genetic information, rather than an increase. The two variations have
separated, but the reason for their division is not that either one has
acquired any new genetic data. Neither variation has acquired any proteins
or new enzymes, much less a new organ. There is no development here.
On the contrary, instead of a previous population that contains different,
possibly recessive, pieces of genetic information (using our example,
a population with both long and short fur, and dark and light coloration),
there are now two populations that is each relatively impoverished in
terms of genetic data.
Therefore, nothing about speciation provides any support for the theory
of evolution. Because it claims that all living species developed by
chance, from the simple to the more complex, therefore, in order for
the theory of evolution to be taken seriously, it needs to demonstrate
mechanisms that can increase genetic information. The bifurcation of
an existing species because of a loss of genetic variation, obviously,
a different phenomenon entirely.
Evolutionists actually admit this lack of relevance. For that reason,
evolutionists describe examples of variations within a species, and speciation
by division into two populations (as you saw in the previous section)
as micro-evolution—in the sense of variation within a species that
already exists. However, the use of the word "evolution" in the term
is deliberately misleading, because no evolutionary process is happening
at all. The situation consists of only various combinations and distributions
of genetic information already existing in that species' gene pool.
Then how did living types first emerge? How did the five kingdoms—monera,
protista, fungus, plant and animal—emerge on Earth? How did the
higher categories—the phyla, classes, orders, families; and for
that matter, such basic categories as mammals, birds, vertebrates and
crustaceans—first appear? These are the questions that evolutionists
need to address.
As already stated, evolutionists refer to these subjects as macro-evolution,
which is actually what they mean by the theory of evolution, because
the genetic variations that Darwinists insist on calling "micro-evolution" are
biological phenomena that everyone can observe and agree on. And no matter
how much evolutionists employ the term evolution in describing such phenomena,
they actually have nothing to do with evolution at all. On the other
hand, the macro-evolution claim, has no supporting evidence, either in
biological observations or in the fossil record.
People lacking sufficient information on the subject may well fall into
the error of thinking that "Since micro-evolution takes place in a very
short space of time, macro-evolution could take place over tens of millions
of years." Some evolutionists fall into the exact same error or seek
to make use of it to convince others of the truth of their theory. All
the so-called proofs of evolution proposed by Charles Darwin in The Origin
of Species are of that kind, as are the examples put forward by later
evolutionists. In their examples, they seek to use as evidence for their
theory the genetic variety that they describe as micro-evolution but
which actually has nothing at all to do with what they describe as macro-evolution.
Despite all this discussion of micro- and macro-evolution and speciation,
living things appeared on Earth as types with their own different structures
(as is confirmed by the fossil record). Different variations and subspecies
may appear within them, thanks to the richness of their gene pools. For
example, there are rabbits that exhibit variations such as white fur,
grey fur, longer or shorter ears, and these variations become more pronounced
in a given environment, depending on which natural conditions support
them most appropriately. But species never turn into other species. There
is no natural mechanism that can effect this, that can design new types
and develop the new organs, systems and body plans they require. Every
species has been created with its own unique structures. And since God
has created every one of them with a potential for variety, a wide but
finite variation often emerges within each type.
Evolutionist Admissions Concerning Speciation
The
rabbit species displays considerable possible variations within
itself, such as white fur, grey fur, long or short ears. However,
one type never turns into another.
Apart from amateurs with only a superficial knowledge of the subject,
just about all evolutionists are well aware of the real difficulty they
face in trying to account for the diversity of species on Earth. In his
book Genetics and the Origin of Species, Theodosius Dobzhansky, one of
the architects of neo-Darwinism, stated that the real problem facing
evolutionists was the variety of life.200
This is the real issue on which Darwin and his followers must shed light.
In The Origin of Species, Darwin offered no concrete evidence, but merely
speculated. In one letter, cited by his son Francis Darwin in his book
Charles Darwin's Life and Letters, he admitted this: "When we descend
to details, we can prove that no one species has changed."201
Darwin hoped that the answers to these questions would later be found
and the formation of species proven over the course of time and with
further scientific research. On the contrary, scientific discoveries
have refuted Darwin every time. Despite all the efforts made by evolutionists
over the intervening 150 years, speciation through evolutionary mechanisms
has remained devoid of any proof to support it—as shown by honest
confessions on the subject by various evolutionists.
Although speciation is the backbone of the theory of evolution, it is
also a concept strikingly shrouded in darkness. (More accurately, evolutionists
possess no other evidence than the examples of micro-evolution and variation
they have distorted.) For example, in a paper published in 1999, the
Indiana University biologists Troy Wood and Loren Reiseberg wrote that
very little is known about the biological mechanisms that give rise to
species formation.202 As Professor Gareth Nelson of the American Museum
of Natural History admits, "The ‘species problem'' is perennial,
and speciation remains as much a black box as ever."203
Cornell University's Professor Richard Harrison sets out the latest
position in an article published in Nature magazine in 2001:
Natural communities harbor an enormous variety of species ... But what
of the origin of diversity? Much less has been written about how new
species arise—although the process of speciation is central to
evolutionary biology.204
It is not at all surprising, actually, that so very little has been
written, because scientific discoveries have revealed that one species
cannot turn into another and that change takes place only within species,
and within specific bounds. Not a single example of speciation through
evolutionary mechanisms has been observed. In an article published in
the 18 January, 2001, edition of Nature, the evolutionist biologists
Darren Irwin, Staffan Bensch and Trevor Price admit as much: "The evolutionary
divergence of a single species into two has never been directly observed
in nature."205
Professor of Anthropology Jeffrey Schwartz, from Pittsburgh University,
emphasizes the same fact in his book, Sudden Origins: Fossils, Genes,
and the Emergence of Species:
... Nevertheless, it was and still is the case that, with the exception
of Dobzhansky's claim about a new species of fruit fly, the formation
of a new species, by any mechanism, has never been observed. 206
Faced with these facts, some evolutionists propose an alibi along the
lines of "We cannot observe speciation through evolution, because evolutionary
mechanisms act over such lengthy periods of time. Therefore, speciation
cannot be observed in nature or in the laboratory." This search for consolation
has no scientific basis: No case of speciation has ever been seen in
creatures such as fruit flies or bacteria, whose life spans are very
brief. Thousands of generations of these organisms can therefore be observed
by a single scientist in a few years' time.207 Countless experiments
and studies have to date been conducted on various micro-organisms and
animal species, and all have demolished evolutionist dreams.
Fruit
flies have been bred and subjected to mutations for some 70 years.
But no evolutionary change has ever taken place. No case of speciation
has been encountered, and fruit flies have remained as simply
fruit flies.
One evolutionist, Kevin Kelly, editor of Wired magazine and director
of the All Species Foundation, states that :
Despite a close watch, we have witnessed no new species emerge in the
wild in recorded history. Also, most remarkably, we have seen no new
animal species emerge in domestic breeding. That includes no new species
of fruit flies in hundreds of millions of generations in fruit fly studies,
where both soft and harsh pressures have been deliberately applied to
the fly populations to induce speciation... In the wild, in breeding,
and in artificial life, we see the emergence of variation. But by the
absence of greater change, we also clearly see that the limits of variation
appear to be narrowly bounded, and often bounded within species. 208
Fruit flies have been reared and constantly subjected to mutations for
some 70 years, but no speciation has ever been encountered. No evolutionary
change has taken place, and fruit flies have always remained fruit flies.209 Similarly, no new species or multi-celled organism has emerged from the
experiments and research conducted for many years on the single-celled
bacterium Escherichia coli, which has always remained E coli.210
The fossil record itself also definitively rejects the concept of speciation.
In the fossil record, there is no trace of the countless intermediate
forms that should, according to Darwinism, have once existed.211
Among His Signs is the creation of the heavens and Earth and all
the creatures He has spread about in them.
(Surat ash-Shura, 29)
The origin of species, the emergence of new species and the diversity
of life cannot be explained in terms of natural processes and random
factors, as the theory of evolution maintains. Moreover, recent findings
show that Darwinism is an unscientific and unrealistic theory, and a
great many scientists today are aware of this. However, very few biologists
express such views openly, out of a fear of being excluded from the scientific
world. One of these is Professor Lynn Margulis of Massachusetts University,
whose views on this subject were included in Kevin Kelly's book Out of
Control: The New Biology of Machines:
"It is totally wrong. It's wrong like infectious medicine was wrong
before Pasteur. It's wrong like phrenology is wrong. Every major tenet
of it is wrong," said the outspoken biologist Lynn Margulis about her
latest target: the dogma of Darwinian evolution. [With her theses], Margulis
was ... denouncing the modern framework of the century-old theory of
Darwinism, which holds that new species build up from an unbroken line
of gradual, independent, random variations. Margulis is not alone in
challenging the stronghold of Darwinian theory, but few have been so
blunt. 212
In
all the years of experimentation and research into the bacterium
Escherichia coli, no other species of bacterium of other multi-celled
organism has ever emerged. E. coli has always remained E. coli.
In "Ecology, Evolution and Behavior," an article in the 11 May, 2000,
edition of Nature magazine, Professor Tilman neatly sum up the evolutionist
dilemma:
The existence of so great a diversity of species on Earth remains a
mystery.213
In conclusion, evolutionists have no answers regarding the origin and
diversity of species. If they wish to find the answer, then they must
abandon their belief in Darwinist deceptions and instead accept that
it is Omniscient and Almighty God Who created every living species with
its rich potential for variation.
Creation is unique to God. No matter how they may strive, those who
deny this fact will inevitably be doomed to disappointment:
Humanity! An example has been made, so listen to it
carefully. Those whom you call upon besides God are not even able to
create a single fly, even if they were to join together to do it. And
if a fly steals something from them, they cannot get it back. How feeble
are both the seeker and the sought! (Surat-al-Hajj, 73)
184 "Macroevolution, Its Definition, Philosophy
and History," http://www.talkorigins.org/faqs/macroevolution.html . 185 Theodosius Dobzhansky, Genetics and the
Origin of Species, New York: Columbia University Press, 1937. 186 Richard B. Goldschmidt, The Material
Basis of Evolution, New Haven: Yale University Press, 1940,
p. 8. 187 Scott Gilbert, John Opitz, Rudolf Raff, "Resynthesizing
Evolutionary and Developmental Biology," Developmental Biology
173, Article No. 0032, 1996, p. 361.. 188 R. Lewin, "Evolutionary Theory Under
Fire," Science, vol. 210, 21 November 1980, p. 883. 189 T. Fagerstrom, P. Jagers, P. Schuster,
E. Szathmary, "Biologists put on mathematical glasses," Science,
vol. 274, 20 December 1996, pp. 2039-2040.. 190 Sean B. Carroll, "The Big Picture," Nature,
Vol. 409, 8 February 2001, p. 669; Paul R. Ehrlich, Human Natures,
Washington, D.C.: Shearwater Books, 2000, p. 46. 191 D.H. Erwin, "Macroevolution is more than
repeated rounds of microevolution," Evolution & Development,
Vol. 2, 2000, pp. 78-84. 192 J.W. Valentine, D.H. Erwin, "Interpreting
Great Developmental Experiments: The Fossil Record," in , R.A.
Raff, E.C. Raff (editors), Development as an Evolutionary Process,
New York: Alan R. Liss, Inc., 1987, p. 95. 193 C.R. Woese, "Macroevolution in the microscopic
world", C. Patterson (editor), Molecules and Morphology in
Evolution, Cambridge: Cambridge University Press, 1987, p.
177. 194 Troy E. Wood, Loren H. Rieseberg, "Speciation:
Introduction", Encyclopedia of Life Sciences, 1999, g.els.net. 195 J.A. Endler, "Conceptual and Other Problems
in Speciation,", in D. Otte, J.A. Endler (editors), Speciation
and Its Consequences, Sunderland, Massachusetts: Sinauer Associates,,
1989, p. 625. 196 Prof. Dr. Ali Demirsoy, Yasamin Temel
Kurallari, Vol. I / November I, 11th ed., Ankara: Meteksan
Yayinlari, , 1998, p. 624. 197 M. Encarta Encyclopedia 2001 Deluxe Edition
CD, "Spider (arthropod).". 198 Timothy A. Mousseau, Alexander E. Olvido, "Geographical
Variation," Encyclopedia of Life Sciences, 2000, g.els.net. 199 The same also applies to human beings.
The different races on Earth have different characteristics
due to their geographic isolation. Dark skin came to predominate
in one race and since these people lived in the same region
and reproduced among themselves, a black-skinned race came
into being. The same applies to oriental races. The differences
in question (skin color, eye color and shape, height, hair
color, etc.) were present in the genetic information of the
first human beings, but some of these characteristics gradually
came to predominate in human populations in different regions
of the world, and different races emerged accordingly. Were
it not for geographic isolation, if all the races on Earth
had intermarried for centuries, then everyone would be a "cross-breed," there
would be no blacks, whites or orientals. All human beings would
be an "average" of these features. 200 Theodosius Dobzhansky, "Genetics and
the Origin of Species", American Midland Naturalist, Vol. 18,
No. 6 (Nov., 1937), preface.. 201 Francis Darwin, The Life and Letters
of Charles Darwin, Vol. II, New York: D. Appleton and Company,
, 1888, p. 210. 202 Troy E. Wood, Loren H. Rieseberg, "Speciation:
Introduction", Encyclopedia of Life Sciences, 1999, www.els.net. 203 G. Nelson, "Species and Taxa: Systematics
and Evolution,", in D. Otte, J.A. Endler (editors), Speciation
and its Consequences, Sunderland, Massachusetts: Sinauer Associates,
1989, pp. 73-74. 204 Richard G. Harrison, "Diverse origins
of biodiversity," Nature, Vol. 411, 7 June 2001, pp. 635-636. 205 D.E. Irwin, S. Bensch, T.D. Price, "Speciation
in a ring," Nature, Vol. 409, 18 January 2001, p. 333. 206 Jeffrey H. Schwartz, Sudden Origins:
Fossils, Genes, and the Emergence of Species, New York: John
Wiley & Sons, , 2000, p. 287.. 207 For detailed information, see Harun Yahya,
Darwinism Refuted, New Delhi: Goodword Books, November 2000. 208 Kevin Kelly, Out of Control: The New
Biology of Machines, London: Fourth Estate, 1995, p. 475. 209 Gordon R. Taylor, The Great Evolution
Mystery, New York: Harper & Row, 1983, p. 48. 210 L.P. Lester, R.G. Bohlin, The Natural
Limits to Biological Change, second edition, Dallas: Probe
Books, , 1989, p. 88. 211 For detailed information, see Harun Yahya,
Darwinism Refuted, New Delhi: Goodword Books, November 2000. 212 Kevin Kelly, Op cit., pp. 470-471. 213 David Tilman, "Causes, consequences and
ethics of biodiversity," Nature, Vol. 405, 11 May 2000, p.
208.