scientific american - 2000 07 - alien civilizations if they really exist, why aren''t they here
scientific american - 2000 07 - alien civilizations if they really exist, why aren't they here
... in
1950. If extraterrestrials are commonplace, he asked, where
38 Scientific American July 2000 Where Are They?
SEARCHING FOR EXTRATERRESTRIALS
Copyright 2000 Scientific American, Inc.
Where Are They? ... www.sciam.com
ALIEN CIVILIZATIONS
If they really exist,
why aren’t they here?
DEADLY LAKES
Exclusive: Preventing
a catastrophe in Cameroon
THE WHY OF WEIGHT...
scientific american - 1993 07 - telling resonable risks from fools' chances
... are
constant, apparently because they are
necessary for HIV to function as a ret-
rovirus. They establish that HIV is the
SCIENTIFIC AMERICAN July 1993 47
Copyright 1993 Scientific American, Inc.
descendant ... been
the signiÞcance of the information con-
cept to molecular evolution and its tech-
nological applications.
Copyright 1993 Scientific American, Inc.
SCIENTIFIC AMER...
scientific american - 1994 07 - how cancers defeat drug therapy
... of the Þeldwork be-
cause many of the men have off-site jobs.
SCIENTIFIC AMERICAN July 1994 35
Copyright 1994 Scientific American, Inc.
years ago. A judicious choice of fast-
maturing varieties ... that the worldÕs biggest environ-
mental release occurred over decades
at a site called Tomsk-7 in central Sibe-
ria. Tomsk-7, whose existence was clas-
20 SCIENTIFIC AMERICAN July 1994...
scientific american - 1995 07 - can implants cure diabetes
... Images
Copyright 1995 Scientific American, Inc.
T
he high-temperature supercon-
ducting ceramics that amazed
physicists when they were discov-
ered in 1986 have been amazing mate-
rials scientists ... necessary to compare
products. What it often fails to do, how-
ever, is to translate data-on-a-screen
into the understanding-in-a-head need-
ed to make a decision. Ultimately the
economics...
scientific american - 1996 07 - hawking vs penrose
... Inc.
SA
Copyright 1996 Scientific American, Inc.
News and Analysis28 Scientific American July 1996
BY THE NUMBERS
The Changing Quality of Life
T
hese maps show the Physical Quality of Life Index
(
PQLI), ... on the differing rates of de-
News and Analysis Scientific American July 1996 35
PANACEA LOST?
Pity the economist who tries
to market social insights
ECONOMICS
Copyright 1996...
scientific american - 1997 07 - an endangered buddha contemplates oblivion
... Mediterranean.
Treasures at Dunhuang
Copyright 1997 Scientific American, Inc.
ROBERTO OSTI
Copyright 1997 Scientific American, Inc.
Scientific American Month 1997 1
ROME
ALEXANDRIA
QUILON
BUKHARA
HAMADAN
GUANGZHOU
TYRE
BAGHDAD
REY
MARY
SAMARKAND
KASHI
SHACHE
BARBARICUM
HOTAN
DUNHUANG
XI’AN
ANXI
BEIJING
TURPAN
ANTIOCH
ENCROACHING ... some
back-of-the-envelope doodling and
created a...
scientific american - 1998 07 - new victories against hiv
... LABORATORY
43 Scientific American July 1998
Copyright 1998 Scientific American, Inc.
The most important
requirement for life on
Earth (the only kind we
know) is liquid water.
Under present condi-
tions ... REPORT
82
84
88
90
94
96
98
104
106
Copyright 1998 Scientific American, Inc.
The Mars Pathfinder Mission
46 Scientific American July 1998
The rocks analyzed by Pathfinder,
howe...
scientific american - 1999 07 - molecules from space
... down-
loading music from the Internet in the
May issue.
News and Analysis Scientific American July 1999 41
CYBER VIEW
On-Line U.
DAVID SUTER
Copyright 1999 Scientific American, Inc.
Life’s Far-Flung ... form
blood if they are placed in bone marrow.
Vescovi says that if other stem cell types
can also modify their fates in this sur-
prising way “you are looking at a reser-
30 Scie...
scientific american - 2000 01 - we were not alone only we remain why
... JPL
Copyright 1999 Scientific American, Inc.
News and Analysis
22 Scientific American January 2000
E
ven when humans aren’t doing
it, they are likely to be think-
ing about it. The representa-
tives of ... North American
placentals dated to 80 million years, so
why aren’t there any placentals from that
30-million-year interval? Cifelli notes
that if placentals did arise in North...
scientific american - 2000 02 - galileo finds fire and brimstone on jupiter's moon io
... Scientific American
more in 1999, Einstein or Zorpette?
Copyright 2000 Scientific American, Inc.
CHAN
N
ot often does a past geolog-
ic event exemplify what the
actions of humanity may in-
flict on ... of California at Los An-
geles, are giving way to more vicious actions, such as booby-trapped mail and arson.
JOSEPH SOHM ChromoSohm, Inc./Corbis
Copyright 2000 Scientific American, I...