scientific american - 2001 12 - india, pakistan and the bomb

scientific american   -  2001 12  -  india, pakistan and the bomb

scientific american - 2001 12 - india, pakistan and the bomb

... Copyright 2001 Scientific American, Inc.Copyright 2001 Scientific American, Inc. or Life By Rakesh K. Jain and Peter F. Carmeliet Copyright 2001 Scientific American, Inc.Copyright 2001 Scientific American, ... 2001 Scientific American, Inc. 36 SCIENTIFIC AMERICAN DECEMBER 2001 BETTMANN/CORBIS Profile of the most-talked-about environmental issues of the 20t...
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scientific american   -  1993 03  -  black holes and the centrifugal force paradox

scientific american - 1993 03 - black holes and the centrifugal force paradox

... radar and laser altimeter, which together can determine the thick- ness of the ice and the nature of the underlying rock. With Robin E. Bell of the Lamont-Doherty Geological Obser- vatory, the co-leader ... fac- tors,Ó Gendelman says. The NMDA re- ceptor could be that pathway.Ó And gp120 has a role in this activi- ty as well. Not only does the viral pro- tein stimulate t...
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scientific american   -  1994 12  -  nasa's latest view of the earth

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

... conclusion. De- spite the hype surround- ing the Þeld, the experts wrote, Òthere is a substan- tial gap between the tech- nology that is available and the technology that is needed to realize the po- tential ... 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 nonagg...
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scientific american   -  1995 12  -  the puzzle of consciousness

scientific american - 1995 12 - the puzzle of consciousness

... planet. The spacecraft examined the outer expanses of the earthÕs magnet- ic Þeld and took the Þrst mea- surements of the moonÕs far side since the days of the Apol- lo program. These images re- vealed ... first slide the trousers off onto the rope, then push one leg through the other. The outside leg is reversed twice in the process, leaving the trousers on the...
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scientific american   -  1996 12  -  traces of the big bang

scientific american - 1996 12 - traces of the big bang

... leishmani- asis is being conducted, and the “pep- tideria,” where the synthesized peptides that form the basis of the malaria vac- cine are stored. He also points out myr- iad other labs and the entrance ... because the power and economy of mass- produced processors are often cited as factors in the collapse of the supercomputing market. As much cheaper and easier-to-u...
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scientific american   -  1997 12  -  building the biggest

scientific american - 1997 12 - building the biggest

... self- expression and access to all informa- tion. The Web can help people to un- derstand the way that others live and love and are human, to understand the humanity of people,” Berners-Lee ex- pounds, ... mega- hertz. By analyzing the peaks and val- leys and how they change as the fre- quency rises, Sinha’s software calculates the density of the hidden material, the...
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scientific american   -  2000 12  -  rulers of the jurassic seas

scientific american - 2000 12 - rulers of the jurassic seas

... back-to-back on a common piece of tetracene. One FET injects elec- trons, and the other injects holes; in the middle they annihilate and produce yel- low-green light (it should be easy to mod- ify ... of the spec- trum known as L-band as the worldwide standard for digital radio. The U.S. dis- agreed, preferring a solution known as in-band, meaning that the digital signal would...
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scientific american   -  2001 03  -  sculpting the earth from inside out

scientific american - 2001 03 - sculpting the earth from inside out

... Molecule OXYGEN Copyright 2001 Scientific American, Inc. Scientific American March 2001 19www.sciam.com News & Analysis R ENO, NEV. The Chicxulub Cra- ter, sprawled across the Gulf of Mexico and the Yucatán Penin- sula, ... off the dimers and breaking the DNA strand next to them, the en- zymes initiate a repair process that other cellular enzymes complete. Daniel Ya...
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scientific american   -  2001 05  -  get the idea (tomorrow's web will)

scientific american - 2001 05 - get the idea (tomorrow's web will)

... strategies and the cost-benefit dimensions of what the response should be if they do one or the oth- er.” He concludes: “We have the evolved capacity to adopt either strategy.” These are hardly the words ... studies such the- ories. Artificial-intelligence and Web re- searchers have co-opted the term for their own jargon, and for them an ontology is a document or file that fo...
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scientific american   -  2001 06  -  the paradox of the sun's hot corona

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

... archaeologists tell layers apart by playing a game of which-stars- are-not-like -the- others. The sun and most other stars swirl around the galactic center within a thin circular disk. Nearly a ... their convictions. And if you say to either one of them they’re wrong, then they start tuning you out.” So McNutt tries to make the 15-year-olds aware of the other’s position and valu...
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