scientific american special edition - 1990 01 - is the brain''s mind a computer program

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Ngày tải lên: 12/05/2014, 16:23

... Appalachian children. While our Appalachian study was un- der way, Diaz and one of his graduate students, Marnie H. Frauenglass, video- taped 32 three- to six-year-olds in the laboratory as the ... highly academically gifted adoles- cents revealed that more than 95 percent show a strong dis- parity between mathematical and verbal interests. Extraordinarily strong mathematical and spatia...

Ngày tải lên: 12/05/2014, 16:39

... moving. The 270-meter-long Sarato- ga, for example, was the first U.S. aircraft carrier and the victim of kamikaze attacks at Iwo Jima that killed 123 sailors. Damage from the attacks is still visible ... South America, before the construc- tion of the Panama Canal. (Be- ing merely the southern parts of the Atlantic, Pacific and Indian oceans, the “Southern Ocean” has been...

Ngày tải lên: 12/05/2014, 16:24

... stars and galaxies 2 001 Telescope Facility (NASA) INTEGRAL, International Gamma- Obtain spectra of neutron stars, black holes, 2 001 Ray Astrophysics Lab (ESA) gamma-ray bursters and active galactic ... ma- jor goes wrong during assembly. The British magazine New Scientist has de- cided, on the basis of a statistical analysis of risks, that there is a 73.6 percent chance of at le...

Ngày tải lên: 12/05/2014, 16:24

... Americans —Asian -American women—and the shortest, Native American men. Asian -American women like Mary are outliving even Japanese women. But Native Amer- ican men in Bennett County, South Dakota, have the ... overdoses, alcoholism and suicide are all factors in the early demise of many rock musicians. Nationwide, the Bureau of Labor Statistics says, highway crashes are the lea...

Ngày tải lên: 12/05/2014, 16:26

... breaking in these games. In the 1960s the best players in baseball were argu- ably Hank Aaron and Willie Mays, and in fact those two are now generally regarded as the greatest living ballplayers. ... what it was on the eve of the 1996 At- lanta Games is revealing —and perhaps a little de- pressing. The tests, technology and administrative procedures available to sports official...

Ngày tải lên: 12/05/2014, 16:26

... that the cerebral neocortex plays a dominant role. Visual information from the retina reach- es the neocortex mainly by way of a part of the thalamus (the lateral geniculate nu- cleus); another ... visual areas in the cortex. It is unclear whether an intact primary visual cortex region is essential for immediate visual awareness. Conceivably the visual signal in blindsigh...

Ngày tải lên: 12/05/2014, 16:26

... supernova —type Ia—quite precisely. Death Star WHAT IS A TYPE IA SUPERNOVA ? Essentially, it is the blast that occurs when a dead star becomes a natural thermonuclear bomb. Spectacular as this final ... unlike balls near the earth’s surface, CDM particles move in a gravitational field that is not constant. After all, the grav- itational field is produced by all the partic...

Ngày tải lên: 12/05/2014, 16:26

... that have no electrical charge evaporate until all their mass is radiated away, black holes with electrical or (in theory) magnetic charge cannot do that; their evaporation ceases when the gravitational ... Because this has not happened, there must be some way out.” Twenty more famous theoretical phys- icists are called to the stand. All that be- comes clear is that they cannot agree....

Ngày tải lên: 12/05/2014, 16:26

... in equa- torial locations were areas of very faint x-ray emis- sion the so-called coronal holes. Connection to the Starry Dynamo EACH MAJOR SOLAR SPACECRAFT since Skylab has offered a distinct ... a limited scale. It appears that heat was transferred, at least in the relatively recent past, by the eruption of vast plains of basaltic lava and later by the volcanoes that grew on t...

Ngày tải lên: 12/05/2014, 16:27