scientific american - 2004 01 - loop quantum gravity

... concentration camp. january 2004 SCIENTIFIC AMERICAN Volume 290 Number 1 features www.sciam.com SCIENTIFIC AMERICAN 3 92 The Curta calculator COPYRIGHT 2003 SCIENTIFIC AMERICAN, INC. the observed ... division. When oxygen-starved, embryos with knocked- out san-1 or mdf-2 failed to sort chromo- somes properly as they grew. The researchers note that these kinds of genes are highly...

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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 ... homogeneous. SCIENTIFIC AMERICAN January 1993 75 IRON ABUNDANCE (SOLAR UNITS) OXYGEN-TO-IRON RATIO (SOLAR UNITS) 0 .010 . 001 0.1 1.0 4 3 2 1 HALO STARS OLD DISK STARS Copyright 1992...

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... the low-ener- SCIENTIFIC AMERICAN January 1994 73 QUADRUPOLE FOCUSING MAGNETS CERENKOV DETECTOR TIME-OF-FLIGHT DETECTOR VECTOR CHAMBER Copyright 1993 Scientific American, Inc. gy down-quark states ... that short-term destruction en- sures long-term gainÑis poorly under- stood by the general public. Much of the press coverage of Hurricane An- drew and its impact on the Florida Ev- ergla...

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... stream. $500.00 $100.00 $50.00 $100.00 $500.00 $400.00 $450.00 $350.00 DEPOSIT CHECK#314 DEPOSIT CHECK#315 4/5/94 4/26/94 4/27/94 11/3/94 011 111000000 0010 1010 1000000 0010 00 0011 1 1011 10BITSTREAM: UNINTENDED 5-BIT KEY (VALUE OF 011 11=15) INTENDED 4-BIT KEY (VALUE OF 011 1=7) UNINTENDED 15-BIT DATA BYTE INTENDED 7-BIT DATA BYTES LAURIE ... Spring 1992. 010 111000000 0010 1010 00000...

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... OGDEN Copyright 1995 Scientific American, Inc. SCIENTIFIC AMERICAN January 1996 31 easily destroyed. Moreover, some theo- rists raised certain technical objec- tions, namely, that the release of a pho- ton ... re- sults of toxicity experiments on ani- mals before he would consider his tap- water safe. Indeed, Cabaniss and other high-tech types emphasize that for now, old-fashioned labo...

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... PALSY” F o r e ! T r i c k s o f t u r b u l e n c e s t i l l d e f y s u p e r c o m p u t e r s Copyright 1996 Scientific American, Inc. mother bought him an Apple II com- puter and a 300-bits-per-second mo- dem. Class valedictorian, he went on to the University ... 1996 Scientific American, Inc.Copyright 1996 Scientific American, Inc. T hese should be the best of times for teleph...

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... five-mile-wide, six-foot-thick chunk of the polar ice cap stopped turn- ing 12 days ago, on October 2. The hull is now encased in thick, azure ice on all sides. If the 50 scientists from 17 re- search ... him as a pick-me-up be- fore his final oral exam, he grad- uated third in his class. “I ap- peared before the jury looking like death,” he recalled in a 1988 interview, “without hav- ing been...

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... egregious hu- man-rights violations. For this reason, critics say the view of the Internet as a jug- gernaut for implementing sweeping reforms is an over- blown, North-centric perspec- tive. “How ... Program of the American Association for the Advancement of Science. The North-South dichoto- my could worsen as the expe- riences of countries such as In- donesia and China make oth- er nations...

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... and its technol- ogy last July, the FAA gathered 24 ADS- B-equipped aircraft of various sizes (everything from a Boeing 757 and sev- eral 727s to a navy P-3 Orion and a sin- gle-engine Piper ... co-conspirator, to set an example, and hire you as a computer security ex- SCHRÖDINGER’S GAMES For quantum prisoners, there may be no dilemma QUANTUM GAME THEORY Copyright 1999 Scientific Ame...

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... Aspirin 0 28 Scientific American January 2 001 Bouncier than ever MIKE NEVEUX Corbis News Briefs Copyright 2000 Scientific American, Inc. Scientific American January 2 001 29www.sciam.com Profile C HEVY ... propos- als pending in Congress. When added to the $575 million provid- ed in 2000 by HHMI, U.S. biomedical sci- entists will have a veritable embarrass- ment of riches. (The Londo...

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