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
... in1950. If extraterrestrials are commonplace, he asked, where38 Scientific American July 2000 Where Are They? SEARCHING FOR EXTRATERRESTRIALSCopyright 2000 Scientific American, Inc.Where Are They? ... www.sciam.com ALIEN CIVILIZATIONS If they really exist, why aren’t they here? DEADLY LAKESExclusive: Preventinga catastrophe in CameroonTHE WHY OF WEIGHTCERN’s new colliderseeks why matter has massSPECIAL ... searchesby Andrew J. LePage40 Scientific American July 2000 Where Are They? Copyright 2000 Scientific American, Inc.1975. It was later extended by various re-searchers, most notably physicist FrankJ....
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scientific american - 1993 07 - telling resonable risks from fools' chances
... areconstant, apparently because they arenecessary for HIV to function as a ret-rovirus. They establish that HIV is the SCIENTIFIC AMERICAN July 1993 47Copyright 1993 Scientific American, Inc.descendant ... beenthe signiÞcance of the information con-cept to molecular evolution and its tech-nological applications.Copyright 1993 Scientific American, Inc. SCIENTIFIC AMERICAN July 1993 43VIRUSES BELONG ... into self-perpet-uating units at the dawn of life. They show how information can be generat-ed and processed at the molecular lev-el. The essence of their genetic infor-mation is self-preservation,...
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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 35Copyright 1994 Scientific American, Inc.years ago. A judicious choice of fast-maturing varieties ... that the worldÕs biggest environ-mental release occurred over decadesat a site called Tomsk-7 in central Sibe-ria. Tomsk-7, whose existence was clas-20 SCIENTIFIC AMERICAN July 1994Managed Care, ... iden-tiÞed by color. All grayish-to-white minerals are feldspar.Tiny orange grains are iron-magnesium minerals.Copyright 1994 Scientific American, Inc.that the giant impact led to the forma-tion...
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scientific american - 1995 07 - can implants cure diabetes
... ImagesCopyright 1995 Scientific American, Inc.The high-temperature supercon-ducting ceramics that amazedphysicists when they were discov-ered in 1986 have been amazing mate-rials scientists ... necessary to compareproducts. What it often fails to do, how-ever, is to translate data-on-a-screeninto the understanding-in-a-head need-ed to make a decision. Ultimately theeconomics of understanding ... be-fore it could be cost-eÝective for large-scale production, comments John Van-der Sande, a researcher at the Massa-chusetts Institute of Technology andco-founder of American Superconduc-tor....
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scientific american - 1996 07 - hawking vs penrose
... Inc.SACopyright 1996 Scientific American, Inc.News and Analysis28 Scientific American July 1996BY THE NUMBERSThe Changing Quality of LifeThese maps show the Physical Quality of Life Index(PQLI), ... on the differing rates of de-News and Analysis Scientific American July 1996 35PANACEA LOST?Pity the economist who tries to market social insightsECONOMICSCopyright 1996 Scientific American, ... have all the featuresthere, but somehow they are more stunt-ed. Why were they nutritively so under-nourished?” Concluding that the prob-lem was overpopulation, Talwar ob-served that the available...
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scientific american - 1997 07 - an endangered buddha contemplates oblivion
... Mediterranean. Treasures at DunhuangCopyright 1997 Scientific American, Inc.ROBERTO OSTICopyright 1997 Scientific American, Inc. Scientific American Month 1997 1ROMEALEXANDRIAQUILONBUKHARAHAMADANGUANGZHOUTYREBAGHDADREYMARYSAMARKANDKASHISHACHEBARBARICUMHOTANDUNHUANGXI’ANANXIBEIJINGTURPANANTIOCHENCROACHING ... someback-of-the-envelope doodling andcreated a pattern us-ing two different dia-mond shapes, onewide and the otherthin. One nifty thingabout this pattern wasits nonperiodicity—al-though ... SIMONELLIEVERETT COLLECTION; 20TH-CENTURY FOXCopyright 1997 Scientific American, Inc.News and Analysis24 Scientific American July 1997In Brief, continued from page 22Fur-ensic EvidenceIn 1994 a...
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scientific american - 1998 07 - new victories against hiv
... LABORATORY43 Scientific American July 1998Copyright 1998 Scientific American, Inc.The most importantrequirement for life onEarth (the only kind weknow) is liquid water.Under present condi-tions ... REPORT82848890949698104106Copyright 1998 Scientific American, Inc.The Mars Pathfinder Mission46 Scientific American July 1998The rocks analyzed by Pathfinder,however, are not basalts. If they are vol-canic‚ as suggested ... ulcer-causing bacterium Heli-cobacter pylori (left) in62 percent of the peo-ple they tested withheart disease. In com-parison, H. pylori affect-ed only 40 percent ofmatched control sub-jects....
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scientific american - 1999 07 - molecules from space
... down-loading music from the Internet in theMay issue.News and Analysis Scientific American July 1999 41CYBER VIEWOn-Line U.DAVID SUTERCopyright 1999 Scientific American, Inc.Life’s Far-Flung ... formblood if they are placed in bone marrow.Vescovi says that if other stem cell typescan also modify their fates in this sur-prising way “you are looking at a reser-30 Scientific American ... evolutionary psy-chology has put him at odds with intel-lectual heavyweights such as StephenJay Gould and Noam Chomsky. 32 Scientific American July 1999SAM OGDENCopyright 1999 Scientific American, ...
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scientific american - 2000 01 - we were not alone only we remain why
... JPLCopyright 1999 Scientific American, Inc.News and Analysis22 Scientific American January 2000 Even when humans aren’t doingit, 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 that30-million-year interval? Cifelli notesthat if placentals did arise in NorthAmerica, they either ... and its technol-ogy last July, the FAA gathered 24 ADS-B-equipped aircraft of various sizes(everything from a Boeing 757 and sev-eral 727s to a navy P-3 Orion and a sin-gle-engine Piper...
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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.CHANNot often does a past geolog-ic event exemplify what theactions 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./CorbisCopyright 2000 Scientific American, Inc.W here ... data—got stuck.by Torrence V. Johnson40 Scientific American February 2000 Copyright 2000 Scientific American, Inc.Scientific American February 2000 41NASA/JET PROPULSION LABORATORY (main image...
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