scientific american - 1994 03 - visiting yourself in the past
scientific american - 1994 03 - visiting yourself in the past
... grown.Copyright 1994 Scientific American, Inc.MARCH 1994 $3.95 In the deep Atlantic, Nautile hunts for cluesto the forces that make continents drift. Visiting yourself in the past. Rewriting the genes.Information ... of the original miner-als in the peridotite. Some minerals,such as clinopyroxene, melt more easi-ly than do others and hence rapidly de-crease in abundance during the melt-ing. Moreover, the ... FULLERCopyright 1994 Scientific American, Inc.Mayewski hopes better insight into the inconstant nature of the sun willenable researchers to determine whether the present, human-generated increas-es in...
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scientific american - 1993 03 - black holes and the centrifugal force paradox
... ferrying the virus across the blood-brain barrier. Another main-tains the blood-brain barrier is some-how disrupted, permitting the entry ofviral particles or infected cells.Once there, the virus ... callthis the seeing-is-believing principle.The true signiÞcance of the see-ing-is-believing principle was notrevealed to me until 1985. Oneday in the spring of that year I gave an informal ... level, Paulinghas had to endure cutbacks at the non-proÞt institute he founded in 1973 toinvestigate his vitamin theories. The Li-nus Pauling Institute of Science and Med-icine in Palo Alto,...
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scientific american - 1995 11 - guardian cells in the brain
... sur-rounding the Antarctic far inland. The three-million-year-old diatoms found byHarwood might also have been trans-ported from open sea into the Trans-antarctic Mountains, mingling with the much ... belching up gas now and then—or whether theyresult from the sound bouncing back and forth along the path between the source and the receiving instrument.Schlindwein and her co-workers point ... experts. The NRC, which is the operating arm of the National Academyof Sciences and the National Academy ofEngineering, is proba-bly the most capable in theory of Þlling in for the OTA. The NRCÕsdetailed...
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scientific american - 1994 10 - special issue - life in the universe
... areversions of string theory that predictsomething like the menu of Þelds in- corporated in the Standard Model.But string theory has had no success-es yet in explaining or predicting any of the numerical ... theirmemories of running the maze. The ma-jor diÝerence was that the Þring wasmore rapid, as if the memories were be-ing run on fast-forward. The Þring oc-curred during slow-wave sleep, a phaseof ... time, using them to in- fer the primordial distribution of mat-ter. This information can in turn be usedto deduce the initial inhomogeneitiesat 10Ð12second after the beginning.From the austere...
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scientific american - 1994 04 - the dilemmas of prostate cancer
... disease of rene-gade cells. Tissue from the uterine lin-ing proliferates in other areas of the body, such as the bladder, intestine or, in rare cases, the lung. How these cellsreach the distant ... work-erÑby the purely domestic impact of the decline in productivity growth.If foreign competition is neither the main villain in the decline of man-ufacturing nor the root cause ofstagnating ... TCDD; the people mostcontaminated in the 1976 industrial ac-cident in Seveso, Italy, had 56,000 ppt in their blood.)Other Þndings support the dioxinconnection. In 1992 German research-ers...
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scientific american - 1994 06 - was there a race to the moon
... conditions. At the be-ginning of the race, the runners line upat the startÑthat is, they are well local-ized. Each one runs in one of the quan-tized Bohr orbits. During the initial laps, the runners ... howoften it occurs. The standard neo-Dar-winian picture in evolution, in whichmutation is the main engine for intro-ducing genetic novelty, has proved ex-tremely powerful over the past half acentury. ... manipulate single atoms. Find-ing the best way to exploit these tech-nologies will be aided by the under-standing we obtain from studies of the classical limit. The profound diÝerences between the quantum...
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scientific american - 1994 12 - nasa's latest view of the earth
... use. In a carÕs motor, pistonsmove through the cylinders, each dis-placing a certain volume. Expanding gas-es pushing on the piston produce pow-er. The combined volume for all the cyl-inders ... in the brain. Like the brain, the network must undergo a ÒtrainingÓ pro-cess. In the police network, input pro-cessors accept personnel informationabout an individual oÛcerÑsuch as cit-izen ... laser sin-teringÑa way to do 3-D photocopying.Sintering essentially reverses the resultof scanning: a computer-guided laserRelinquishing Relics3-D copies of artifacts could stand in for the...
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scientific american - 1997 03 - the rising seas - how much of a threat
... in its wake. The ultra-violet glow detected by this instru-ment therefore outlines the shapeof the sun’s wind. So far these mea-surements indicate that the solarwind is more intense in the ... links joining the lip-ids to one another, changing the colorof the film to a reddish magenta. The sensitivity of the test scheme islimited mainly by the ability of the hu-man eye to distinguish ... decommissionedsubmarines. Since 1993 (the year theyfirst gave a candid account of theirdumping activities), the Russians haveceased injecting low-level liquid wasteinto the Pacific. But with the continuingeconomic...
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scientific american - 2001 03 - sculpting the earth from inside out
... responsiblefor feeling an itch. Examininganesthetized cats, theytracked the response ofthese neurons when itch-inducing histamine was ap-plied to the skin. The discov-ery, reported in the JanuaryNature ... chronicling theirway of life in a record-selling book andprizewinning documentaries. NapoleonChagnon’s research catapulted the Yano-mamö into the limelight as the fierce peo-ple of the rain forest, ... activists. Por-traying the Yanomamö as killers, theywarned, furnished miners with a pow-erful means of turning the public against the Indians. Neither was Chagnon mak-ing friends in Venezuela,...
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