eredeti ár:
A termék ára Líra Könyv Zrt.-nél, ami nem tartalmaz online kedvezményt.
2350 Ft
online ár:
Webáruházunkban a termékek mellett feltüntetett fekete színű online ár csak internetes megrendelés esetén érvényes. Amennyiben a Líra bolthálózatunk valamelyikében kívánja megvásárolni a terméket, akkor az adott boltban lévő ár az irányadó.
eredeti ár:
A termék ára Líra Könyv Zrt.-nél, ami nem tartalmaz online kedvezményt.
4190 Ft
online ár:
Webáruházunkban a termékek mellett feltüntetett fekete színű online ár csak internetes megrendelés esetén érvényes. Amennyiben a Líra bolthálózatunk valamelyikében kívánja megvásárolni a terméket, akkor az adott boltban lévő ár az irányadó.
eredeti ár:
A termék ára Líra Könyv Zrt.-nél, ami nem tartalmaz online kedvezményt.
4990 Ft
online ár:
Webáruházunkban a termékek mellett feltüntetett fekete színű online ár csak internetes megrendelés esetén érvényes. Amennyiben a Líra bolthálózatunk valamelyikében kívánja megvásárolni a terméket, akkor az adott boltban lévő ár az irányadó.
ár a könyvön:
Az eredeti ár (könyvre nyomtatott ár), a kiadó által ajánlott fogyasztói ár, amely megegyezik a bolti árral (bolti akció esetét kivéve).
9990 Ft
online ár:
Webáruházunkban a termékek mellett feltüntetett fekete színű online ár csak internetes megrendelés esetén érvényes. Amennyiben a Líra bolthálózatunk valamelyikében kívánja megvásárolni a terméket, abban az esetben az eredeti ár (könyvre nyomtatott ár) az érvényes, kivétel ez alól a boltban akciós könyvek.
ár a könyvön:
Az eredeti ár (könyvre nyomtatott ár), a kiadó által ajánlott fogyasztói ár, amely megegyezik a bolti árral (bolti akció esetét kivéve).
5900 Ft
online ár:
Webáruházunkban a termékek mellett feltüntetett fekete színű online ár csak internetes megrendelés esetén érvényes. Amennyiben a Líra bolthálózatunk valamelyikében kívánja megvásárolni a terméket, abban az esetben az eredeti ár (könyvre nyomtatott ár) az érvényes, kivétel ez alól a boltban akciós könyvek.
eredeti ár:
A termék ára Líra Könyv Zrt.-nél, ami nem tartalmaz online kedvezményt.
1120 Ft
online ár:
Webáruházunkban a termékek mellett feltüntetett fekete színű online ár csak internetes megrendelés esetén érvényes. Amennyiben a Líra bolthálózatunk valamelyikében kívánja megvásárolni a terméket, akkor az adott boltban lévő ár az irányadó.
eredeti ár:
A termék ára Líra Könyv Zrt.-nél, ami nem tartalmaz online kedvezményt.
2490 Ft
online ár:
Webáruházunkban a termékek mellett feltüntetett fekete színű online ár csak internetes megrendelés esetén érvényes. Amennyiben a Líra bolthálózatunk valamelyikében kívánja megvásárolni a terméket, akkor az adott boltban lévő ár az irányadó.
^ SA Perspectives
Self and Circuitry
Walk down the average American street, and you
won't pass many adults who are 100 percent human anymore—at least not physically. Our mouths are studded with dental fillings, posts, crowns and bridge-work. More than a few of us have surgical screws, pins...
] SA Perspectives
In Science We Trust
As a year for science, 2002 was marked by many wonderful accomplishments, and our inaugural listing of the Scientific American 50, beginning on page 23, celebrates dozens. But much of the public may also remember the year for blemishes on the scientific...
^ SA Perspectives
The Climate Leadership Vacuum
If you still doubt that global warming is real and that humans contribute to it, read the article beginning on page 40. Its author, James Hansen of the NASA God-dard Institute for Space Studies, is no doomsayer. Instead of relying on just computer...
^ SA Perspectives
A Pound of Flesh
In 2001 more than 6,000 people in the U.S. died while waiting for an organ transplant. The dire shortfall of organs compared with patient demand is growing as the population ages and more people experience organ failure. Although new immunosuppressive drugs...
on the beat
NASMD AT 25
by Bob O'Donnell
he worlds of commerce and education do not form easy alliances. If educators or administrators need the goods or services of a particular business, they usually only agree to work with the supplying company on a very limited basis.
In some instances...
ISA Perspectives
How to Kill Synthetic Biology
PROGRAMMED CELLS obey chemical commands.
Thirty-three years after the invention of gene-splicing, the reality of biotechnology is still far short of what many once dreamed it would be, partly because the tools for manipulating genes have been...
_ LETTERS TO THE EDITORS
Tomorrow's World Today
The September 1991 special issue of Scientific American, "Communications, Computers and Networks," is wonderful. There hasn't been anything in print that comes close to the quality of material that you assembled to cover these critical...
LETTERS TO THE EDITORS Count on Confusion Robert M. May makes excellent points in "How Many Species Inhabit the Earth?" [Scientific American, October 1992]. I was especially taken by his suggestion that butterflies have attained the "honorary stams of birds." Giving the currently known species of...
_ LETTERS TO THE EDITORS
More Black Hole Paradoxes
I enjoyed "Black Holes and the Centrifugal Force Paradox," by Marek Artúr Abramowicz [SciENTinc American, March), very much but was left somewhat puzzled. As we all know, centrifugal force is a fictitious force that appears to exist when a...
_ LETTERS TO THE EDITORSRelative AlternativesIn "Black Holes and the Centrifugal Force Paradox" [SciENTinc American, March], Marek Arwr Abramouicz proposed that dose to a black hole the cen-nifugal force acting on orbltmg objects would push them inward. A different interpretation of the phenomenon...
From the Editors
Recognizing Technological Genius
Americans have always taken great, justified pride in their inventiveness. Even at the birth of this country, that tradition was in k. place: when the founding fathers weren't busy inventing the U.S., they were oft:en inventing other useful...
From the Editors
The Misunderstood Clone
Oh, give me a clone
Of my own flesh and bone
With its Y chromosome changed to X
And when it is grown
Then my own little clone
Will be of the opposite sex.
he late, great Isaac Asimov co-authored that doggerel with Randall Garrett decades ago, but...
From the Editors Defending Reason Reasonably
Alarmed by the public's continuing enthusiasm for the paranormal, the illogical and the unreasonable, many scientists and skeptics have gone on the defensive. They warn that this wave of irrationalism threatens to engulf society and, in the process,...
FROM THE EDITORS
Getting Complicated
he fate of the universe used to be so simple. It was either fire or ice. Either the combined gravity of the universe would bring its expansion to a halt, compelling the cosmos to replay the big bang in reverse, or else gravity would steadily weaken and the...
from the Editors Worm Gets the Early Bird
/ ea, the stars are not pure in his sight," reads the Book of Job. I "How much less man, that is a worm?" Typical. As Bartlett's Fa-' miliar Quotations will attest, worms are the most famously low vermin in literature. People are usually the writers'...
From the EditorsBuilding ExcitementOne of the most popular children's videos of recent years had no singing dinosaurs, spaceships, talking dogs or cartoon characters. What it had was bulldozers. And giant cranes, and back-hoes, and wrecking balls, and other pieces of heavy equipment for putting up...
FROM THE EDITORS
The Way to Go
Modern humans probably walked out of Africa about 100,000 years ago, then kept on going. First by foot, then on horseback, boat, wheels and wings, our kind has charged across the land and seas to every part of the globe. While one courageous minority invaded the...
From the EditorsMaking (Up) FiistoryGod cannot alter the past," Samuel Butler wrote, "but historians can." Even in the absence of revisionist impulsesremember the better known maxim that history is written by the winnersanyone reconstructing past events will almost inevitably get parts wrong,...
from the editors
Current Events
Roy C. Sullivan of Virginia was not a lucky man, but the sorry circumstances of his life make for one of the most mythic entries in the Guinness Book of Records. He holds the distinction of having been struck by lightning seven times between 1942 and 1977. The...
From the Editors
The Future and Past of China
M ^ hina's name means "the Middle Kingdom," a title that places I this giant country at the geographic, cultural and intellectual
^ hub of the world. With the repatriation of Hong Kong, the Middle Kingdom is again indeed at the center of the...
From the Editors
Go Ahead, Walk in the Mud
Percy Bysshe Shelley's poem Ozymandias describes the cracked and toppled statue of an ancient potentate: "My name is Ozymandias, king of kings: Look on my works, ye Mighty, and despair!" The destruction of his once great empire might be mistaken as...
from the editors
Seriously, We're Not Kidding
Something about April Fools' Day makes magazine readers cynical. Every year around now we get at least a few letters saying, "All right, very funny. You really had me going there for a minute. Until I realized I was reading the April issue, 1...
FROM THE EDITORS
MORE ORDERLY INTERNET may be a lot less fun but also a lot more useful.
Civilizing the Internet
Conan the Librarian"? No, that doesn't fit the profile. Librarians are mousy, bespectacled fussbudgets, as faintly musty as the books they curate, at least in the popular...
From the Editors The Animal QuestionSome readers, on first seeing our cover story, will think they smell a rat, and not just the one pictured. Researchers may fear that Scientific American is giving comfort to the enemy, the animal-rights protesters trying to turn laboratories upside down. Animal...
1
From the Editors
Experienced Readers for Young Minds
THE MORRISONS, Pljylis aud Philip, select the Young Readers Book Awards.
his issue marks only the second occasion of the Scientific American Young Readers Book Awards, but it builds on a much longer tradition. Every December since 1949,...
From the Editors
Reasons for Hope
1
rr
I his may be the first special issue of Scientific American that, for I everyone on the staff, also qualifies as a personal issue. Several of us have had brushes with cancer, or at least its specter. We have seen family members, friends and co-workers...
T
FROM THE EDITORS
Aliens at Play
he classic bugaboo of animal behavior research is the sin of anthropomorphism: Thou Shalt Not Think of the Beast as Man. No matter how much an animal may seem to act like a person, professors sternly warn students, never forget that millions of years of...
Letter from the Editor
Maybe life would just seem longer. That was my first reaction upon learning that we might be able to extend our life spans—and Improve our general health—by putting ourselves on a tough diet. As Richard Weindruch explains in "Caloric Restriction and Aging" (page 32), a...
Preface
M olecular medicine, the newest and most advanced branch of medical science, began some 2,400 years ago, when Democritus proposed that the living organism is composed of arrangements of atoms that are continuously lost and faithfully replaced. Democritus, the father of the atomic theory,...
SA Perspectives
Get Real
When the cloning of a human was announced last December, political and spiritual leaders condemned it as an affront to the "dignity of man." That kind of rhetoric is popping up all over the place. Political scientist Francis Fukuyama warns that genetic engineering and...
FROM THE EDITORS
Dear Scientific American Subscriber:
Once upon a time, say, 2,000 and more years ago. Earth was the only world in the universe and the planets were just wandering lights in the sky. So the Greeks believed, anyway. Our understanding of the universe has expanded just a bit since...
^ SA Perspectives
Penny-Wise, Planet-Foolish
Somewhere in the inner solar system, there's a rock with our name on it. Literally. In March the International Astronomical Union named a newly discovered asteroid 14145 SciAm, on the recommendation of its discoverer, Edward Bowell of Lowell...
SA Perspectives
Land of Fire
As you read this, the horrific 2002 wildfire season is drawing to a close. And in what has become an annual ritual, many are asking, "Why are things so bad?" This summer more than six million acres burned, thousands of people had to flee for their lives, and the...