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.orLifeBy Rakesh K. Jain and Peter F. CarmelietCopyright 2001 Scientific American, Inc.Copyright 2001 Scientific American, ... 2001 Scientific American, Inc.36 SCIENTIFIC AMERICAN DECEMBER 2001 BETTMANN/CORBISProfileof the most-talked-about environmental issues of the 20th century. The year before her 1986 walk in the ... limitedperiod (the 1980s and early 1990s) and alimited number of states, it cannot be takenas the last word on the subject. Neverthe-less, it adds weight to the notion that tough-on-crime policies...
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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 the synthesis of toxic cy-tokines, ... that these particles were generat-ed by the decay of something other thana top and antitop pair. The Fermilab observations include an-other bit of evidence that supports the top-quark hypothesis....
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scientific american - 1994 12 - nasa's latest view of the earth
... conclusion. De-spite the hype surround-ing the Þeld, the expertswrote, Òthere is a substan-tial gap between the tech-nology that is available and the technology that isneeded 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 nonaggressive.How the 50-year-long rela-tionships ... interconnectedprocessors. The processing elements and the connections among them cor-respond roughly to neurons and syn-apses in the brain. Like the brain, the network must undergo a ÒtrainingÓ pro-cess. In the...
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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 ... first slide the trousers off onto the rope, then push oneleg through the other. The outside leg isreversed twice in the process, leaving the trousers on the rope right-side out butwith the legs ... and pointing to-ward the man’s feet. Reach into the trousers from the waist and turn bothlegs inside out. The trousers are now re-versed on the rope and in position to beslipped back on the...
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scientific american - 1996 12 - traces of the big bang
... leishmani-asis is being conducted, and the “pep-tideria,” where the synthesized peptidesthat 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 oftencited as factors in the collapseof the supercomputing market. Asmuch cheaper and easier-to-use work-stations based on off -the- shelf ... UtahCopyright 1996 Scientific American, Inc.The turn-of -the- century stonebuilding is rotting inside, floor-boards dusty and dilapidated,pigeons roosting in the eaves. There areno windows in the moldy...
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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 speed of sound through it and the ... which they originally resid-ed. Instead they flow rather freely be-tween the atoms and are said to be de-localized. But they stay in or around the cluster because they are attracted to the now...
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scientific american - 2000 12 - rulers of the jurassic seas
... back-to-back on a commonpiece 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 worldwidestandard for digital radio. The U.S. dis-agreed, preferring a solution known asin-band, meaning that the digital signalwould be sent over the ... memo at the time, de-manding to know how a compa-ny of 34 people, “including the janitor,” could outdo his thou-sands of engineers.) The outstand-ing problem in computer design(then as now)...
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scientific american - 2001 03 - sculpting the earth from inside out
... MoleculeOXYGENCopyright 2001 Scientific American, Inc.Scientific American March 2001 19www.sciam.comNews & AnalysisRENO, NEV. The Chicxulub Cra-ter, sprawled across the Gulf ofMexico and the Yucatán Penin-sula, ... off the dimers and breaking the DNA strand next to them, the en-zymes initiate a repair process that othercellular enzymes complete.Daniel Yarosh is the founder and CEOof AGI Dermatics, the ... traps and are then transferred to the chips, all with-in a vacuum chamber. The advantages ofchip-based systems include tighter trap-ping, the precision of the designs that canbe made and the...
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scientific american - 2001 05 - get the idea (tomorrow's web will)
... strategies and the cost-benefit dimensionsof what the response should be if they do one or the oth-er.” He concludes: “We have the evolved capacity to adopteither strategy.” These are hardly the words ... studies such the- ories. Artificial-intelligence and Web re-searchers have co-opted the term for theirown jargon, and for them an ontology isa document or file that formally defines the relations ... in Coto delRey; the others resided within the core of the park, Reserve Biológica. Of the tagged bad-gers, the team recorded 13 deaths, attribut-able mainly to the poachers. The researchersalso...
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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 ... 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 and values.That trick ... makes peo-ple ask more questions.” —Kate WongNEW ENTRY into the hominid ranks30 SCIENTIFIC AMERICAN JUNE 2001 Copyright 2001 Scientific American, Inc.32 SCIENTIFIC AMERICAN JUNE 2001 newsSCAN■...
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