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scientific american - 2000 01 - we were not alone only we remain why

scientific american   -  2000 01  -  we were not alone  only we remain  why

scientific american - 2000 01 - we were not alone only we remain why

... cousins. Only we remain. Why? Our species had at least15 cousins. Only we remain. Why? We Were Not Alone We Were Not Alone Copyright 1999 Scientific American, Inc.News and Analysis32 Scientific American ... two Boe-ing 747s were flying toward eachanother along the same airway but sep-arated vertically by a safe and whole-some 2,000 feet. As the jets drew with-in spitting distance, however, the ... 1999 Bank of Swe-den Prize in Economic Sciencesin Memory of Alfred Nobel, the cita-tion from the Royal Swedish Academyof Sciences states that “his most impor-tant contributions were made in...
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scientific american   -  2000 09  -  muscles & genes  are star athletes born, not made

scientific american - 2000 09 - muscles & genes are star athletes born, not made

... faced with person-nel changes and the vagaries of funding.Keeping a lab’s Web server running andup-to-date is a long-term commitment.As opposed to the well-publicized ri-valry between the HGP ... of vol-unteers to perform an array of cognitivetasks while they were exposed to simu-lated cell-phone emissions from head-sets. The emissions had no apparent ef-fect on short- or long-term ... HAZARDSFive-year-old10-year-oldAdultCELL-PHONE ENERGY penetratesmore deeply into a child’s brain than anadult’s, as shown in these models.Copyright 2000 Scientific American, Inc.Scientific American...
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scientific american   -  1993 01  -  the turbulent birth of the milky way

scientific american - 1993 01 - the turbulent birth of the milky way

... 4,650 4,40012-BILLION-YEAR-OLD AGE TRACK15-BILLION-YEAR-OLD AGE TRACKNGC 288NGC 362Copyright 1992 Scientific American, Inc.means that within the halo the only re-maining main-sequence stars ... ßat-bot-tomed cumulus clouds moved west-ward on light trade winds. Calm seas were rarely disturbed by squalls sweep-ing into the northeastern Caribbean Seafrom the Atlantic Ocean. The only ... of warm-er water, however, Pocillopora suÝeredhigher mortality and lower fecundi-ty, and large corals were consequentlyopen to attack by the sea star. The pred-atory crustaceans were also...
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scientific american   -  1994 01  -  searching for strange quark matter

scientific american - 1994 01 - searching for strange quark matter

... London28 SCIENTIFIC AMERICAN January 1994Copyright 1994 Scientific American, Inc.Variously dry, wet or anywherebetween, wetlands are by theirnature protean. Such constantchange makes wetlands ... developers while pro-tecting the ecological features of wet-lands. Fluctuating water levels and thesensitivity of wetlands to these chang-es as well as the dependence of wet-lands on the surrounding ... would require that hydric vegeta-tion be present in every wetland. It alsostipulates that wetlands be classiÞedaccording to a once-and-for-all determi-nation of a wetlandÕs value or function.In...
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scientific american   -  1995 01  -  warning  -  digital documents in danger

scientific american - 1995 01 - warning - digital documents in danger

... stream.$500.00$100.00$50.00$100.00$500.00$400.00$450.00$350.00DEPOSITCHECK#314DEPOSITCHECK#3154/5/944/26/944/27/9411/3/94 011 111000000 0010 1010 1000000 0010 00 0011 1 1011 10BITSTREAM:UNINTENDED 5-BIT KEY(VALUE OF 011 11=15)INTENDED4-BIT KEY(VALUEOF 011 1=7)UNINTENDED 15-BITDATA BYTEINTENDED7-BIT DATABYTESLAURIE ... the ste-reoscope was invented. It was not until the 1950s, howev-er, that so-called random-dot stereograms, which resem-ble Jackson Pollack paintings, were created. At that time, ac-cording ... Spring1992. 010 111000000 0010 1010 00000 0010 00 0011 1 1011 10BITSTREAM:REAL NUMBER“1.3125”INTEGER“21”LOGICAL BITMAPNO, NO, NO, YESNO, YES, NO, YESSOUNDCHARACTER“U”IMAGELAURIE GRACECopyright 1994 Scientific...
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scientific american   -  1996 01  -  the diet - aging connection

scientific american - 1996 01 - the diet - aging connection

... lookedup and wondered. Well, as of two weeksago, we know.Ó ÑCorey S. Powell SCIENTIFIC AMERICAN January 1996 23Copyright 1995 Scientific American, Inc.24 SCIENTIFIC AMERICAN January 1996Checking ... Theorganism remains susceptible to a top-of-the-line antibiotic called vancomycin,but authorities fear that may not last.The American Society for Microbiolo-gy reported last year that between 1989and ... no.MIDDLETON/LIITTSCHWAGERCopyright 1995 Scientific American, Inc.Once upon a time, when fuel pric-es were high, nuclear fast-breed-er reactors enjoyed brief famebased on a singular claim. While pro-ducing energy...
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scientific american   -  1997 01  -  parkinson's disease

scientific american - 1997 01 - parkinson's disease

... connec-tions between its members can be inferred. Why floweringtrees suddenly proliferated in that period remains controver-sial. The 80 taxa of charcoal flowers unearthed here, in combi-nation ... PALSY”Fore!TricksofturbulencestilldefysupercomputersCopyright 1996 Scientific American, Inc.mother bought him an Apple II com-puter and a 300-bits-per-second mo-dem. Class valedictorian, he went on tothe University of California ... service.Of course, speed alone won’t guaran-tee @Home’s success, not with other ca-ble mavens readying high-speed servic-es of their own. Excalibur, a joint ven-ture of Time-Warner Cable and Time,Inc.,...
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scientific american   -  1998 01  -  flying over the solar system

scientific american - 1998 01 - flying over the solar system

... therefore able togrow not only embryos with nohead but also ones that were noth-ing but a head. The embryos were not kept alive beyond about threedays, at which point an embryohas only precursors ... For one thing, car-bon and silicon do not mix well. “Car-bon’s not that happy in that lattice,”Sturm notes. To accommodate the un-easy union, researchers have had to re-sort to specialized ... machines, two radiosand one weapon,” he says. “A GPS re-ceiver is handy, too; yesterday the fogrolled in while we were out there, and we couldn’t see the ship anywhere.”As we stop on the way to...
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scientific american   -  1999 01  -  revolution in cosmology

scientific american - 1999 01 - revolution in cosmology

... real, why aren’t we un-dergoing a renaissance unparalleled inhuman history?” he demands, almost ir-ritably. “I mean, why aren’t we duplicat-ing the golden days of Athens or the Ital-ian ... Theyalso noted the subjects’ otherhealth behaviors, such as exer-cise patterns, smoking and drink-ing, and looked at how all thoseaffected food choices. The al-most 3,000 subjects were classi-fied ... egregious hu-man-rights violations. Forthis reason, critics say theview of the Internet as a jug-gernaut for implementingsweeping reforms is an over-blown, North-centric perspec-tive. “How...
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scientific american   -  2000 02  -  galileo finds fire and brimstone on jupiter's moon io

scientific american - 2000 02 - galileo finds fire and brimstone on jupiter's moon io

... traces.To answer that, chemist John T. Arm-strong of the National Institute of Stan-dards and Technology used spectral-an-alyzer software and a database contain-ing high-precision x-ray measurementsto ... to-gether like a jigsaw puzzle to producethe 33.4-million-base-pair sequence.The report,in the December 2, 1999,Na-ture, also identified 11 gaps—shortstretches of repetitious code—that were ... painstakingly sepa-rated thousands of salt-grain-size for-ams from their muddy mass grave us-ing a tiny paintbrush. Her search re-vealed that 55 percent of the species ofdeep-sea forams had...
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