scientific american - 1994 01 - searching for strange quark matter

... technique to search for strange quark matter. The Þrst highly sensitive search for strange quark matter and other parti- cles created in high-energy nuclear col- lisions is now being performed by one of ... of quarks have yet been observed. MESONSQUARKS ANTIQUARKS BARYONS UP ANTI- UP DOWN ANTI- DOWN STRANGE ANTI- STRANGE u u – d d – s s – K MESON LAMBDA PI MESON NEUTRON N...

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... 4,650 4,400 12-BILLION-YEAR- OLD AGE TRACK 15-BILLION-YEAR- OLD AGE TRACK NGC 288 NGC 362 Copyright 1992 Scientific American, Inc. means that within the halo the only re- maining main-sequence stars ... from hu- mans, pigs, whales and oth- er species. The National En- dowment for the Arts was named as a co-recipient for allegedly encouraging Knowl- ton “to extend his work in the form o...

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... Nations Copyright 1994 Scientific American, Inc. Such modest nuclear holdings there- fore can suÛce to dissuade an aggres- sor from a nuclear attack. But super- power nuclear forces long ago grew be- yond ... hip lip-shooter find his way through the corridors of power? Laid-Back Leader Rattles the Academy 34 SCIENTIFIC AMERICAN February 1994 CHRIS USHER Black Star Copyright 1994...

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... predictions. Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, Inc. 20 SCIENTIFIC AMERICAN March 1994 In the ÒnaiveÓ quark model, one of the three quarks spins in a direction oppo- site ... remain on the operating table for a while. ÑMadhusree Mukerjee Copyright 1994 Scientific American, Inc. SCIENTIFIC AMERICAN March 1994 21 membranes...

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... his former critics. Gould, in a review in Na- ture, lauded The Diversity of Life as Òa 38 SCIENTIFIC AMERICAN April 1994 Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, ... Borneo. 36 SCIENTIFIC AMERICAN April 1994 Revisiting Old BattleÞelds JASON GOLTZ Copyright 1994 Scientific American, Inc.Copyright 1994 Scientific American, Inc....

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... Canada. Long-term monitoring is needed to track changes. SARAH LEEN Matrix Copyright 1994 Scientific American, Inc. SCIENTIFIC AMERICAN June 1994 33 I n 1939 a 33-year-old French mathe- matician ... up-down action over some unit of time. Schršdinger managed to extract clas- SCIENTIFIC AMERICAN June 1994 45 Copyright 1994 Scientific American, Inc. sical behavior from his...

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... of the Þeldwork be- cause many of the men have off-site jobs. SCIENTIFIC AMERICAN July 1994 35 Copyright 1994 Scientific American, Inc. years ago. A judicious choice of fast- maturing varieties ... iden- tiÞed by color. All grayish-to-white minerals are feldspar. Tiny orange grains are iron-magnesium minerals. Copyright 1994 Scientific American, Inc. that the giant impact led...

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... ultraviolet obser- vatory still sending streams of new re- sults back to the earth. SCIENTIFIC AMERICAN August 1994 39 DEEP-SURVEY TELESCOPE and spectrometers are being pre- pared for integration ... attention to this problem for waters such as the Persian Gulf, which was free of submarines un- 28 SCIENTIFIC AMERICAN August 1994 Attack Submarines for Sale D iesel-powered att...

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... electroweak. These forces become equally strong, joining to form a grand uniÞed force. In that case, leptons be- come relatives of the quarks, and sev- SCIENTIFIC AMERICAN September 1994 43 CHARACTERS ... budget, way behind SCIENTIFIC AMERICAN September 1994 23 Copyright 1994 Scientific American, Inc. schedule and eating into the base pro- gram. I have received hundreds of le...

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... HEAVIER- THAN-AIR FLIGHT THEORY OF RELATIVITY COMMUNICATIONS SATELLITE TRANSISTOR Copyright 1994 Scientific American, Inc. Copyright 1994 Scientific American, Inc. SCIENTIFIC AMERICAN October 1994 ... 0.06 GALAXY 3C 330 REDSHIFT 0.50 DENSITY 0.10 .01 RELATIVE ABUNDANCE 1.0 1.0 10 -2 10 -4 10 -6 10 -8 10 -1 0 HELIUM HELIUM 3 LITHIUM DEUTERIUM Copyright 1994...

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