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Scientific American April 2007 PDF | English | 8 MB $http://rapidshare.com/files/23658990/sa_2007_04.pdf April 2007 Content Feature: A S T R O N O M Y The Ghosts of Galaxies Past Strangely moving stars may be the remnants of past galaxies devoured by our Milky Way. B I O T E C H N O L O G Y Seeking the Connections: Alcoholism and Our Genes Identifying the genetic infl uences on vulnerability to alcohol addiction can lead to more targeted treatments and help individuals make better-informed choices. I N F O RM A T I O N T E C H N O L O G Y The Promise of Plasmonics A technology that squeezes electromagnetic waves into minuscule structures may yield superfast computer chips, ultrasensitive molecular detectors and perhaps even invisibility cloaks. A N IM A L B E H A V I O R Just How Smart Are Ravens? Recent experiments show that these birds use logic to solve problems and that some of their abilities approach or surpass those of the great apes. N E U R O S C I E N C E The Movies in Our Eyes The retina processes information much more than anyone has ever imagined, sending a dozen different movies to the brain. E N E R G Y Gassing Up with Hydrogen Researchers are working on ways for fuel-cell vehicles to hold the hydrogen they need for long-distance travel. M E D I C I N E A Cure for Rabies? The survival of a Wisconsin teenager who contracted rabies may point the way to a treatment for this horrifying disease.
