scientific american - 1994 06 - was there a race to the moon
scientific american - 1994 06 - was there a race to the moon
... along the au-ditory pathway to the thalamus, the cortex and the amygdala, arousing a memorythat leads to a higher heart rate and the cessation of movement.Atmospheric turbulence hampers earthbound ... computers.ÓOn the other hand, Weil doubts wheth-er any human can ever again have a grasp of all of mathematics. One prob-lem, he says, may be that there are toomany mathematicians, especially goodones. ... By then the lunar eÝort had clearly met the goalsthat Kennedy had set out in 1961. Was the race to the moon worth win-42 SCIENTIFIC AMERICAN June 1994 Lunarlander,designed to fit atopthe...
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scientific american - 1994 08 - red tides - a growing hazaed
... Russiaand built a base at Bandar Abbas. The U.S. then assigned two Los AngelesÐclassnuclear-powered attack submarines to patrol and map the area. Roughly a quar-ter of the worldÕs oil passes ... Gulf of Oman, the Med-iterranean, the Arabian Sea and north-ern Indian Ocean, the South China Sea,and PaciÞc waters near the north Asiancoast. If successful, their sales cam-paign could ... Mayr was not a follower of Dar-win. Rather, like most other naturalistsof the day, he subscribed to Jean-Bap-tiste LamarckÕs theory about the inheri-tance of acquired characteristics. ÒAndthat...
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scientific american - 1994 12 - nasa's latest view of the earth
... genes,which play a role in both familial andnonfamilial cancers, BRCA1 apparentlyplays no role in nonfamilial breast andToxic Waste and Race: An Unnatural AssociationHazardous-waste sites are too ... The storyhas it that Douglas-Hamilton was struckby MossÕs remarks about the elephantsÕbehavior and her attention to detail;she agreed to work as his assistant forabout a year in Tanzania and, ... California, download-ed pornographic images and had the pair extradited to stand trial. The twoface additional charges in Utah. The Amateur Action case will be ap-pealed, but in the meantime...
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Tài liệu A Voyage to the Moon pdf
... into the ocean. The circle was whiter and more distinct, where the Gulf Stream runs parallel to the American coast, and gradually grew fainter as it passed along the Banks of Newfoundland, to the ... mutations in the character of na-tions, there are still some features that are common to the same people atall times, and which it would therefore be reasonable to impute to the great unvarying ... much to each other's taste, that there was seldom an even-ing that I did not make him a visit, and pass an hour or two in hiscompany.I learnt from him that he was born and bred at Benares,...
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scientific american - 2002 06 - spintronics - a new twist in computing
... nanometers apart, at the mouth of a channel down which the DNA was to travel. The posts snagged the ball of DNA, and the pres-sure of the molecule against the posts caused it to un-ravel and ... radiation into gravi-tational radiation, and vice versa, with nearperfect efficiency. Such a feat sounds as amaz-ing as transmuting lead into gold—and aboutas plausible. “It is fair to say ... facil-ities nearer the surface. Separating out the highly radioactive materials also allows engi-neers to control the radioactivity and heatgenerated in the glass media that would store the waste,...
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scientific american - 1993 06 - tuning in the radio signals of ancient galaxies
... environmental deg-radation and women.) The changes in the text and the lateappearance of the subject made forgreat drama. Government leaders and the media discussed the fact that the planet gains ... class of active galaxy consists of the quasistellar radio sources, or qua-sars, so named because of their starlikeappearance. Unlike radio galaxies, qua-sars in no way resemble normal galax-ies; ... bondage, and it still hasnÕtchanged all that much. Most of the wom-en in the rural areas have that same cy-cle, and they teach the same values to their children. They teach their sons to order; they...
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scientific american - 1994 01 - searching for strange quark matter
... canlead over several days to death by liverfailure.Four neurotoxins have been studiedin detail. Of these, anatoxin -a and ana-toxin -a( s) seem unique to cyanobacte-ria. The other twoÑsaxitoxin ... dike at the landward boundaryof a salt marsh can prevent the inlandmigration of the marsh when the sea68 SCIENTIFIC AMERICAN January 1994 BOTTOMLAND HARDWOOD WETLANDS that occur in the major ... from the cyanobacterial gen-era Microcystis and Anabaena (commongroups of planktonic cyanobacteria).By feeding cyanobacteria from thoseblooms to laboratory animals, he was able to demonstrate...
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scientific american - 1994 02 - do aerosols slow climatic warming
... with the newestaircraft types: the F-117 Stealth Þght-ers, F-15s and F-16sÑAmericaÕs top-of- the- line ÞghtersÑand the sturdy A- 10ground-attack airplane. Marine and navyaviation units will augment ... inCentral Europe oÝer a guide to appro-priate American tank strength. Ger-many deploys almost 4,000 top-of -the- line tanks, which are as good or betterthan the Þnest American tanks. Franceand the ... cyclosporine is a natural productthat blocks an intracellular signalingpathway, as is the experimental immu-nosuppressant FK 506. Ariad Pharma-ceuticals in Cambridge, Mass., a com-pany specializing...
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scientific american - 1994 03 - visiting yourself in the past
... RESEARCHCopyright 1994 Scientific American, Inc.32 SCIENTIFIC AMERICAN March 1994 Clad in a dark, classically tailoredsuit and black shoes, Subrahman-yan Chandrasekhar approacheswith a slow but ßuid gait. ... plates as they ßoat on the mantle? To Þnd out, the author and his co-workers spent many days deep in the Atlantic on board the Nautile and many more weeks in the laboratory. The an-swers they ... AMERICAN March 1994 47SATELLITE MAP of the North Atlantic reveals the topography of the seaßoor. The satellite used radar to measure variations in sea level, which correlate with the bumps and...
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scientific american - 1994 04 - the dilemmas of prostate cancer
... words, the nuclear wea-pons remain nonlethal. The chairman of the con-ference was John B. Alexan-der, who heads the nonle-thal defense program at LosAlamos National Laboratory and hasbeen called ... lattice. The distortion pattern, called a superlattice, can be seen by x-ray dif-fraction: the ions scatter x-rays ontophotographic Þlm, displaying a charac-teristic pattern that reveals their spac-ing. ... be-gan questioning the value of taxonomyand other whole-animal approaches to biology. Wilson has alleged that JamesD. Watson, the co-discoverer of DNA,who was then at Harvard, Òopenly ex-pressed...
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