scientific american - 1995 12 - the puzzle of consciousness

... stunningmovie of our watery 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. ... 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 refuse of a dayÕs work: fecal pellets that, Peris-sinotto...

scientific american - 1994 04 - the dilemmas of prostate cancer

... eachcycle of the AC Þeld. When the marbleis hopping down the egg tray with the help of the AC Þeld, augmenting the av-erage tilt of the egg tray by increasing the DC voltage does not change the av-erage ... Kazumi Maki of the Universi-ty of Southern California and by the lateJohn Bardeen of the University of Illi-nois, but it is too early to tell whethertheir model applies to our low-tempera-ture ... model slight-ly. Self-organization comes from self-interactions, so our model has to in-clude the push-and-pull between the diÝerent regions of the CDW. One mar-ble at the center of mass is...

scientific american - 1995 06 - the world's strongest magnets

... thatthey were the few Cretaceous survivors. The foundation of this theory beganto shake in 1981, when fossils of Òop-posite birdsÓ were unearthed in Chinaand, then, all over the Northern Hemi-sphere. ... Inc.22 SCIENTIFIC AMERICAN June 1995 one connection between the Hubbleconstant and the age of the universeÓÑit depends strongly on the (unknown)density of the universe and on whichversion of the ... 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...

scientific american - 1996 11 - the origins of immunity

... dif-ferent risk factors may affect the expres-sion of the disorder,” the group con-cludes in the Journal of the American Medical Association. The lead author of the study, the larg-est of ... professor of psychology at the University of Liverpool,and other academics haverufﬂed a few well-groomedfeathers in the staid linguis-tics community. Their gos-sip-grooming hypothesis as-serts ... was “irre-sponsible”; she singles out the New YorkTimes for handing out blame in 1991 on the basis of a condemnatory draft re-port by the Of ce of Research Integrity(then the Of ce of Scientiﬁc...

scientific american - 2000 06 - the birth of molecular electronics

... 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 ... FFlloooorr??MolecularElectronics The Birth of Copyright 2000 Scientific American, Inc.Scientific American June 2000 37ProfileProfileserved specimen of one of the earliest di-nosaurs ever discovered—a 228-million-year-old ... 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...

scientific american - 2000 11 - the future of digital entertainment

... trade. The declinewas reinforced by the social unrest of the late 1960s, which divided the supporters of civil rights.Furthermore, the economic crisis of the 1970s strengthened the hand of the more ... materials pro-vide some of the ﬁrst insightinto the lives of prehistoricwomen, children and the eld-erly—or, as Soffer describesthem, the silent majority.Whereas the activities of prime-age ... at the Universi-ty of Texas at Austin. The algorithm cal-culates the distance of possible paths be-tween the source and destination nodeand then selects the shortest one. Imaginean army of...

scientific american - 2001 06 - the paradox of the sun's hot corona

... absolutely ﬁrmin their convictions. And if you say to either one of them they’rewrong, then they start tuning you out.” So McNutt tries to make the 15-year-olds aware of the other’s position ... to one of the most beau-tiful spectacles in all of nature: a total eclipse of the sun. The two of us were among them. One of us (Phillips)watched from Bulgaria as the glaring disk of the sunwas ... galactic 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...

scientific american day in the life of your brain

... book presents an hour-by-hour, round -the- clock journal of your brain’s activities. Drawing on the treasure trove of information from Scientific American and Scientific American Mind magazines ... 6/26/09 12: 31 PM6/26/09 12: 31 PM6Introduction the nickel-thin layer of the cerebral cortex (or neocortex) that covers the cerebrum.  is is the most recently evolved part of the brain the part, ... SLEEPINGPraise for The Scientiﬁ c American Day in the Life of Your BrainIllustrations © istockphoto.com The SCIENTIFIC AMERICAN Day in the Life of Your Brainflast.indd xviiflast.indd xvii 6/26/09 12: 30...

scientific american - 1994 12 - nasa's latest view of the earth

... loners. The families have very diÝerent char-acters, which reßect the person-ality of the matriarch. In the case of Echo, the family is low-key and nonaggressive.How the 50-year-long rela-tionships ... proÞt-able segments of the market. Among the models offered for sale in a givenyear, the more fuel-eÛcient ones tendto be the smaller, slower, bottom -of -the- line vehicles.More fuel-eÛcient ... be re-produced,Ó accordingto the oÛcial pro-gram. A joint produc-tion of the Annals of Improbable Re-search (described by some as the Madmagazine of science) and the M.I.T. Mu-seum, the...

scientific american - 1996 12 - traces of the big bang

... because the power and economy of mass-produced processors are oftencited as factors in the collapse of the supercomputing market. Asmuch cheaper and easier-to-use work-stations based on off -the- shelf ... one sixth the risk of 5 5- to 64-year-olds. Men are at three times the risk of women; blacks are at two and half times the risk of whites. The geographical pattern of mortality from these 12 conditions ... Univer-sity for their discovery of superfluid he-lium 3.Physiology or Medicine. Peter C. Doher-ty of the University of Tennessee and RolfM. Zinkernagel of the University of Zur-ich, for their...

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