scientific american - 1995 12 - the puzzle of consciousness

... stunning movie of our watery 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. ... returned to the earth over the low-gain antenna. Tape-search- 50 SCIENTIFIC AMERICAN December 1995 JAILBARS, slices of images taken of the asteroi...

Ngày tải lên: 12/05/2014, 15:03

... each cycle of the AC Þeld. When the marble is 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 late John Bardeen of the University of Illi- nois, but it is too early to tell w...

Ngày tải lên: 12/05/2014, 14:54

... that they were the few Cretaceous survivors. The foundation of this theory began to shake in 1981, when fossils of Òop- posite birdsÓ were unearthed in China and, then, all over the Northern Hemi- sphere. ... Inc. 22 SCIENTIFIC AMERICAN June 1995 one connection between the Hubble constant and the age of the universeÓÑ it depends strongly on the (unknown) density of...

Ngày tải lên: 12/05/2014, 15:01

... 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 have ruffled a few well-groomed feathers in the staid linguis- tics community. Their gos-...

Ngày tải lên: 12/05/2014, 15:16

... 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?? Molecular Electronics The Birth of Copyright 2000 Scientific American, Inc. Scientific American June 2000 37Profile Profile served specimen of one of...

Ngày tải lên: 12/05/2014, 16:03

... trade. The decline was 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 insight into the lives of prehistoric women, children and the eld- erly —or, as Soffer describes them, the silent majo...

Ngày tải lên: 12/05/2014, 16:06

... absolutely firm in 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 ... 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 gla...

Ngày tải lên: 12/05/2014, 16:08

... 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 PM 6 Introduction the nickel-thin layer of the cerebral cortex (or neocortex) that covers the cerebrum.  is is the most recently evolve...

Ngày tải lên: 12/05/2014, 16:39

... 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 given year, the more fuel-eÛcient ones tend to be the smaller, slower, bottom -of -the...

Ngày tải lên: 12/05/2014, 14:59

... 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-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 pa...

Ngày tải lên: 12/05/2014, 15:18