scientific american - 1994 12 - nasa''s latest view of the earth
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...
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scientific american - 1994 06 - was there a race to the moon
... angularmomenta. The eccentricity of the cor-responding elliptical orbit determines the spread. The square of the magni-tude of the wave function gives the probability for Þnding the electron at ... 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 ... design of anew heavy-lift space launcher, which hehad designated N-1. In mid-1962 the Keldysh commission authorized the de-velopment of a version of the N-1 thatcould launch 75 tons into earth...
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scientific american - 1993 12 - taming africanized killer bees
... show their gemwas not man-made. Evident-ly, a fragment of natural dia-mond seed slipped into theirsample. Nevertheless, the pro-cess was correct and eventu-ally enabled them to synthe-size ... ag-gressive in doing what it took to suc-ceed,Ó laments James C. McGroddy, di-rector of the research division. The recent upheavals have accelerat-ed the linking of the work of the labo-ratories ... Colombiamost of the countryÕs fertility declineduring the 1980s was the result of in-creasing use of family-planning servic-es by less educated women. In Indone-sia, where the government family-plan-ning...
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scientific american - 1994 01 - searching for strange quark matter
... professor at and di-rector of the Environmental Institute at the University of Massachusetts at Am-herst. He has studied, among other top-ics, the behavior of beavers and the as-sessment of ... Although66 SCIENTIFIC AMERICAN January 1994 Wetlands are often as different in their appearance andin the species they host as they are in the range of sat-uration they experience in the course of ... wouldlower the rate of production of the iso-tope helium 4. The rate of absorption of neutrons, and therefore the rate of helium production, is very sensitive to the total surface area of all the nuggetspresent....
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scientific american - 1994 02 - do aerosols slow climatic warming
... fertilizing them in vitro and let-ting them grow to the eight-cell stage.One or two of the cells are then re-moved from the embryo and analyzedby making millions of copies of one bit of the gene of ... 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 this total.Control of ... to the rules of the academy.A congressional source gives the ex-ample of a research council study of the Earth Observing System, a federalsatellite remote-sensing program. Criti-cisms of the...
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scientific american - 1994 03 - visiting yourself in the past
... which they then useto make predictions.Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, Inc.20 SCIENTIFIC AMERICAN March 1994 In the ÒnaiveÓ quark model, one of the three ... wavelengths. An anal-ysis of the wavelengths and intensities of these x-rays allows a determination of the chemical composition of the min-eral. Collaborating with Nobumichi Shi-mizu of the Woods Hole ... as those exposed in the island of 50 SCIENTIFIC AMERICAN March 1994 PROFILES ALONG THE AXIS of the Mid-Atlantic Ridge reveal the anomalous nature of the Azores area. Here the seaßoorbroadly...
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scientific american - 1994 04 - the dilemmas of prostate cancer
... of hisformer critics. Gould, in a review in Na-ture, lauded The Diversity of Life as Òa38 SCIENTIFIC AMERICAN April 1994 Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, ... 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...
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scientific american - 1994 07 - how cancers defeat drug therapy
... returned the Þrst samples. The Eagle landed on the surface of amare in the Sea of Tranquillity, one of the dark gray areas that paint the fea-tures of the man-in -the- moon. They are the remnants of ... and the earth formed in the sameregion of the evolving solar system. Fi-nally, the hypothesis explains the mostdiÛcult problem: the angular momen-tum of the earth- moon system. The pro-jectile ... many of the men have off-site jobs. SCIENTIFIC AMERICAN July 1994 35Copyright 1994 Scientific American, Inc.years ago. A judicious choice of fast-maturing varieties and the abundance of water...
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scientific american - 1994 08 - red tides - a growing hazaed
... perpendicular to the axis of rotation of the EUVE satel-lite. This axis lies in the plane of the eclipticÑthat of the earth s orbit around the sunÑand is pointed toward andaway from the sun. As the satellite ... now sounds, the young Mayr was not a follower of Dar-win. Rather, like most other naturalists of the day, he subscribed to Jean-Bap-tiste LamarckÕs theory about the inheri-tance of acquired ... 1994 Scientific American, Inc.for the turn of the century, but at pres-ent evasion and electronic countermea-sures are the only way to avoid a torpe-do already in the water. Courtesy of the industrial...
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scientific american - 1994 09 - conquering lyme disease
... superanti-gen, which according to Cleary is wide-ly believed to be the cause of the strep-related toxic-shock syndrome.Cleary also has another study, nowin press with the Proceedings of the Na-tional ... this so-called forbidden interaction, they willhave evidence of the presence of a newparticle. They can then add the particleto the Standard Model, thereby extend-ing it.One class of such ... be-lieve that the data hide any surprises.An upgrade planned for the end of the century should allow Fermilab to pindown the properties of the top quarkand the mass of the W boson. Experi-ments...
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