scientific american - 1995 09 - 150th anniversary issue - key technologies for the 21st century
scientific american - 1995 09 - 150th anniversary issue - key technologies for the 21st century
... SurgeonsMICHAEL CRAWFORDCopyright 1995 Scientific American, Inc.28 SCIENTIFIC AMERICAN September 1995 Squeezed by fast-Þx Prozac dis-pensers on one side and stingyinsurers on the other, therapistswho ... economists can ignore othercountries when they make their theo-ries. Large-scale models of the econo-my, fashionable as science back in the 1960s and nowadays still used for brute-force prediction, ... clus-ters, not uniformly. Exactly how slight the variations can be before the dogloses the scent is unclear and doubt-less varies from dog to dog.Myers says his hypothesis can ac-count for the...
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scientific american - 1993 09 - special issue - life, death, and the immune system
... with the other jumpers to form a complete V-D-J-C gene. This genetic rearrange-ment allows for 4,800 diÝerent vari-eties (100 × 12 × 4 × 1) of heavy chains. The same process occurs in the assem-bly ... the activity of B cells, other T cells and oth-er parts of the immune system.Once formed, cells of both types mi-grate to the spleen, lymph nodes and in-testinal lymphoid tissues. There they ... SyStemix injected can-didate human stem cells into these miceand showed that they could thereby reconstitute the blood-forming and im-mune systems. Interestingly, the hu-man-derived thymus cells...
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scientific american - 1996 09 - special issue - what you need to know about cancer
... happi-er with the present proposal than theywere with the clipper-chip idea. But ac-cording to the administration official,staff-level representatives from the na-tions of the Organization for ... mit.edu/network/pgpfoneThese Key Words for Hire. The In-ternet is becoming so commercial-ized that even key words the en-tries typed in on search engines—areup for sale. IBM, for instance, hasbought the words ... might not necessar-ily welcome their judgments; the Simon Wiesenthal Center, for ex-ample, could rate Nazi sites on the vi-ciousness of their anti-Semitism, eventhough the sites themselves are...
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scientific american - 2002 09 - special issue - a matter of time
... hurricane-forcewinds or earthquakes. Meanwhile the floorstie the inner frame to the outer one, bracing the entire edifice. In the case of the World Trade Center,which was a state-of -the- art design ... MYSTERIOUSFLOWCOPYRIGHT 2002 SCIENTIFIC AMERICAN, INC.events that were once in the unformed future into the con-crete but fleeting reality of the present, and thence relegat-ing them to the fixed past.Obvious ... To avoid FCC reg-ulations, he’s taken his project to tribal na-tions. The legal theory: they have sovereigntynot just on their lands but also over the air-waves. The policy theory: if tribal...
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scientific american - 2003 09 - special issue - better brains
... pro-posed second-generation system known asComputer-Assisted Passenger Pre-Screening,or CAPPS II. In termsof the variety of in-formation, the sys-tem goes much fur-ther than the 1.0 ver-sion—and ... on the fin-ger. The violence escalatedrapidly: subjects increased the force they used by 38 per-cent on each turn. The sci-entists speculate that the subjects underestimated the amount of forcethey ... number, en-joyed high wages relative to those of their fa-thers. Well-off, they could afford to raise fam-ilies. When their children the baby boomers—came of age beginning in the 1970s, they...
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scientific american - 1994 09 - conquering lyme disease
... beselected. In the case of I. scapularis,which accounts for most of the Lymedisease in the U.S., the larval formemerges in the summer from eggs de-posited during the spring. It then at-taches ... ROBOTSINHERIT THE EARTH?Marvin Minsky THE SEARCH FOR EXTRATERRESTRIAL LIFECarl SaganCOMINGIN THE OCTOBER ISSUE THE 1994SINGLE-TOPIC ISSUE LIFE IN THE UNIVERSEGERARD KWIATKOWSKICopyright 1994 Scientific ... jump.They experienced up to a fourfold rise (because they be-gan the experiment with a lower baseline: the pill increas-es the level of estrogen and progesterone and thereby re-duces the relative...
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scientific american - 1995 01 - warning - digital documents in danger
... Southern California ca-sual appears to rule in MunkÕs oÛce,where the sound of the surf and the smell of the sea relax even the most anx-iety-ridden visitor from the Northeast.Despite the ... rights,Ó BenDavis reßects. The problem is, muse-ums donÕt see themselves in the art-in-formation business.Ó ÑCorey S. Powell SCIENTIFIC AMERICAN January 1995 31They fit the profile of certain ... association with the navy. ÒI joined the army because Ithought the end of the world was com-ing. Then the navy started some anti-submarine warfare,Ó in which Roger Re-velle, the late former director...
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scientific american - 1995 02 - bubbles turn sound into light
... ellipticcurves. Further, these curves would vio-late certain conditions set forth in an-other famous supposition in numbertheory, the Taniyama-Shimura conjec-ture. In 1986 Kenneth Ribet of the Uni-versity ... cheek-by-snoutwith people movinginto coastal areas pop-ulated with the ani-malsÕ prized food. Ko-alas prefer to eat the leaves of less than adozen of the 650 na-tive varieties of euca-lyptus ... change in the balance between the two forms of heat-ing superimposed on the natural trendof precession. The Northern Hemisphereis seemingly being forced away from the transport mode toward the radia-tive...
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scientific american - 1995 03 - can science cure crime
... CRAWFORDCopyright 1995 Scientific American, Inc.Getting rid of the long-lived, ra-dioactive by-products of nucle-ar power is a problem that hasstalked the industry for its 40-year his-toryÑand ... has a preju-dice against obesity.Ó ÑW. Wayt Gibbs SCIENTIFIC AMERICAN March 1995 35Copyright 1995 Scientific American, Inc. SCIENTIFIC AMERICAN March 1995 37For the past 30 years the Indianstate ... called for the full lifting of the embargo. For its part, the academy decided totread into the mire of Cuban -American politics when a member documentedone of the worst neurological epidemicsof the...
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scientific american - 1995 04 - machines that learn from hints
... and thusthey began to explore the reasons for the damage to the eggs. The researchers quickly ruled out the possibility that the chemistryof the water where the animalswere laying their eggs ... 1996 Scientific American, Inc.stantially diÝerent from those expect-ed. Resolving the discrepancies may behelpful to theoreticians trying to pre-dict the properties of the long-soughtBose-Einstein ... especially giv-en the decidedly mixed history of the war against the dis-ease. “It has the inference that the cure for cancer isaround the corner and you can select from a menu,” com-ments Samuel...
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