scientific american - 1995 06 - the world''s strongest magnets
scientific american - 1995 06 - the world's strongest magnets
... which of-ten intervene to control the price of their nationÕs cur-rency. In Mexico the centralbank maintained the priceof the peso within a narrow36 SCIENTIFIC AMERICAN June 1995 THE ANALYTICAL ... receive the moneyand send back the change. Tubes re-placed Òcash children,Ó 1 0-, 1 1- and 1 2- year-olds who were exploited to per-form this task. The most elaborate plan for these air-driven ... and lead to the hy-poactivity seen there during clinical de-pression. If he is right, the theory wouldexplain the gender gap, at least in part.Others at the NIMH have more to add.ÒThere are...
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scientific american - 2001 06 - the paradox of the sun's hot corona
... archaeologists telllayers apart by playing a game of which-stars-are-not-like -the- others. The sun and mostother stars swirl around the galactic centerwithin a thin circular disk. Nearly a ... grow the same way that planets do:from the agglomeration of smaller units. The layering of the Milky Way bears that out. On the other hand, cold-dark-matter theorieshave trouble explaining the ... anti-gay crimes. The occurrenceof racial/ethnic offenses declined during the 1990s, while religious and anti-gay offensesheld steady. Many, perhaps most, of these in-cidents were spur-of -the- moment...
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scientific american - 1995 12 - the puzzle of consciousness
... planet. The spacecraft examined the outerexpanses of the earthÕs magnet-ic Þeld and took the Þrst mea-surements of the moonÕs farside since the days of the Apol-lo program. These images re-vealed ... returned to the earthover the low-gain antenna. Tape-search-50 SCIENTIFIC AMERICAN December 1995 JAILBARS, slices of images taken of the asteroid Ida, were re-turned to the earth so that the interesting ... dioxide from the air for theirphotosynthesis. At night, the salps re-turn to the depths as much as a kilome-ter below. There they dump the refuseof a dayÕs work: fecal pellets that, Peris-sinotto...
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scientific american - 1996 06 - the space station
... the impact of urban agriculture con-tinues to broaden, the notion of the gar-den city the turn-of -the- century dreamof urban centers lined with trees and or-namental plants—may take on a new ... datafrom the probe’s 57-min-ute descent did not chal-lenge the prevailing hy-pothesis of the evolutionof the solar system and itslargest planet, according to RichardYoung of the National ... elemental abun-dances (or the lack thereof), measure-ments of the brisk Jovian winds havepermitted slightly more conclusive the- ories about the planet’s meteorology. Be-fore the probe plunged,...
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scientific american - 1997 06 - the microchip that rewires itself
... of bird-watchers, and theylove the birds. And after they watchthem, they go home and put up theirbug zappers. These birds, even the seed eaters, are feedingheavily on insects whenthey’re ... traveling the interstatesince the wee hours of the morn-ing and what they might saywhen they arrive at the Capitoland meet with their elected rep-resentatives. Most of his audi-ence probably ... apply to the hos-pitals. After interviews, the students rank the hospitals in order of preference, while the hospitals similarly rank the students. The NRMP then matches the partici-pants via...
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scientific american - 2000 06 - the birth of molecular electronics
... not seem to be the stuffof wild urban legend anymore. Neverthe-less, the rich mythology that has sprungup around the 840-acre island makes it amust-see stop on the con-spiracy theorist’s world ... pain—drugs in the same class asibuprofen and aspirin. The McGeers, hus-band-and-wife neuroscientists at the Uni-versity of British Columbia, arebetting on nonsteroidal anti-in-flammatories as the first ... Africa. The map shows data on the prevalence of wheezing—a com-monly used indicator of asthma—for 1 3- and 14-year-olds, tak-en from one of the largest epidemiological studies, the Interna-tional...
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scientific american - 1993 06 - tuning in the radio signals of ancient galaxies
... the wom-en in the rural areas have that same cy-cle, and they teach the same values totheir children. They teach their sons toorder; they teach their daughters thatthey must serve even their ... chromosome.To their pleasure, theyrealized that previousgenetic studies had im-plicated roughly the same part of the chro-mosome in SCID.They decided to test the hypothesis that defects in the gam-ma-chain ... Moreover, the depth at which the measured proÞle departsfrom the undisturbed geothermal gra-dient is related to the time that climat-ic change began. The details of the pro-Þle between the surface...
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scientific american - 1994 06 - was there a race to the moon
... Scientific American, Inc. SCIENTIFIC AMERICAN June 1994 33In 1939 a 33-year-old French mathe-matician proved that a profoundconjecture about the behavior dis-played by prime numbers as they ... argue the founders of the Committee for the National Insti-tute for the Environment (CNIE). Whatis needed, they suggest, is their epony-mous institution. The National Institutefor the Environment ... satelliteand the first human to orbit the earth. An ag-gressive, well-funded U.S. effort to place a hu-man on the moon attempted to negate the propaganda value of these Soviet successes. By the mid-1960s...
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scientific american - 1995 05 - what found the top quark
... inhibitcandor when they are posed the ques-tion, ÒHow big is the diÝerence?Ó (Fur-ther, the work has not yet been peer-re-viewed or published, so the team re-mains quite cautious about the details.)Essentially ... small and medi-um-size businesses.Until the early 1990s, the World Bankignored the economic signiÞcance ofthese events or dismissed them as irrel-evant. At the same time, however, the historical ... DNA, the ruthenium-ribose combination revealedsomething extraordinary. The researchers examined the electri-cal properties of short lengths of dou-ble-helix DNA in which there was aruthenium...
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scientific american - 1995 09 - 150th anniversary issue - key technologies for the 21st century
... of the organizers is JeÝrey Gold-stein, a psychologist at Adelphi Univer-sity and president of the five-year-oldSociety for Chaos Theory in Psychologyand the Life Sciences. The point of the meeting, ... need to under-stand their relationshipwith the environment,ÓGonzalez says. Some of the tribes live in the for-est during the rainy sea-son, some during the dryseason, and they all haveslightly ... fully how to opti-mize their talents.Ó ÑMark Derr SCIENTIFIC AMERICAN September 1995 37Copyright 1995 Scientific American, Inc.The best-laid plans for mice andmen use about the same numberof...
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