scientific american - 2003 12 - does race exist

... the first completely laser-powered air- craft —an 11-ounce, five-foot-wide assem- blage of balsa wood, carbon-fiber tubing and Mylar film. The radio-controlled plane cir- cled indoors at a breezy ... cancer. contents december 2003 SCIENTIFIC AMERICAN Volume 289 Number 6 features www.sciam.com SCIENTIFIC AMERICAN 7 78 An amalgam of many races COPYRIGHT 2003 SCIENTIFIC AMERICAN, INC...

Ngày tải lên: 12/05/2014, 16:19

... gangrene BEYOND SMALLPOX COPYRIGHT 2003 SCIENTIFIC AMERICAN, INC. 24 SCIENTIFIC AMERICAN MAY 2003 news SCAN L ike most Internet users, Stanford Uni- versity law professor Lawrence Lessig hates junk e-mail —or, as ... GINSPARG’S ARCHIVE SOURCE: arXiv.org COPYRIGHT 2003 SCIENTIFIC AMERICAN, INC. COPYRIGHT 2003 SCIENTIFIC AMERICAN, INC. www.sciam.com SCIENTIFIC AMERICAN...

Ngày tải lên: 12/05/2014, 16:17

... 2,600, the Þrst ma- jor cutback in its nearly 50-year histo- ry. ÒA lot of people doing the best re- search picked up and left,Ó says Mat- thew P. A. Fisher, a well-known con- densed matter theorist ... computer-based simula- tion as an example of a dual-use tech- nology. Commercial airlines already use simulators for training pilots, and the virtual-reality interfaces, ßat-panel dis- plays...

Ngày tải lên: 12/05/2014, 14:50

... scientiÞc, legal and public atten- tion it can get. ÑKristin Leutwyler 30 SCIENTIFIC AMERICAN December 1994 Copyright 1994 Scientific American, Inc. 32 SCIENTIFIC AMERICAN December 1994 M athematicians ... into ac- The No-Name Virus Questions linger after the Four Corners outbreak Copyright 1994 Scientific American, Inc. 36 SCIENTIFIC AMERICAN December 1994 A thin layer of...

Ngày tải lên: 12/05/2014, 14:59

... gene that caus- es Lesch-Nyhan syndrome, which often involves self-mutilation, is one. Anoth- er is a variant gene for the thyroid hor- mone receptor, which can lead to at- tention-deÞcit hyperactivity ... incentive for Þlling sta- tions to oÝer hydrogen at the pumps. Lacking places to tank up, few people would be willing to buy fuel-cell-pow- ered autos. This chicken-and-egg prob- lem might...

Ngày tải lên: 12/05/2014, 15:03

... easier-to-use work- stations based on off-the-shelf proces- sors increased in power, fewer buyers were willing to pay for relatively com- plex supercomputers based on custom News and Analysis40 Scientific ... BEAM striking a millimeter-size chamber generates x-rays (red spots) in a test of inertial confinement fusion. Copyright 1996 Scientific American, Inc. News and Analysis30 Scientifi...

Ngày tải lên: 12/05/2014, 15:18

... Analysis48 Scientific American December 1997 CYBER VIEW On-line Advertising Goes One-on-One DAVID SUTER 12. 97.SCI.CIT.5P.DOM 8/7/98 12: 44 PM Page 48 Copyright 1997 Scientific American, Inc. H eat ... SPACE TELESCOPE 12. 97.SCI.CIT.5P.DOM 8/7/98 12: 39 PM Page 20 Copyright 1997 Scientific American, Inc. News and Analysis22 Scientific American December 1997 Bringing Up Baby...

Ngày tải lên: 12/05/2014, 15:32

... newer prod- ucts are 5-androstenedione, 4-andro- stenediol, 5-androstenediol, 1 9-4 -norandrostenedione and 1 9-5 -norandrostene- diol. (The Merck Index classifies 5-androstenediol and 1 9-5 -norandrostenediol as ... grandly call it, “speech- recognition technology.” Dictation pro- grams rival SaladShooters for the title of all-time champion in the unwieldy- solution-to-an-insignificant-p...

Ngày tải lên: 12/05/2014, 15:50

... This 1,400-kilometer-long (870-mile-long) fault is the line along which the Anato- lian microplate is rotating westward with respect to the Eurasian plate. Since 1939 a sequence of disastrous earth- quakes ... plat- form wedged in the branches was ef- fortless; despite the humidity, there’s not a bead of sweat on her forehead. She in- hales the early morning air and exudes content- ment. The...

Ngày tải lên: 12/05/2014, 16:00

... two ambipo- lar FETs built 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 ... so-called multiple-instruc- tion issue. Conway programmed a soft- ware simulator that became the de facto blueprint for the ACS-1, bridging concep- tual barriers among logic designers, hard- ware .....

Ngày tải lên: 12/05/2014, 16:06