scientific american - 1999 10 - europa''s ocean

... over time. 58 Scientific American October 1999 The Hidden Ocean of Europa 50 KILOMETERS Copyright 1999 Scientific American, Inc. FROM THE EDITORS 10 LETTERS TO THE EDITORS 14 50, 100 AND 150 YEARS ... surface. Copyright 1999 Scientific American, Inc. Europa Scientific American October 1999 55 IRON CORE ICE SHELL COLD, RIGID SURFACE LAYER WARMER SUBSURFACE ICE ROCKY...

Ngày tải lên: 12/05/2014, 15:59

... pursuits ranging from can- cer to mental health is the Office of Al- ternative Medicine ( OAM). The OAM administers a $7.48-million-a-year pro- gram to assist the medical establish- ment and the public ... nostrums, potions and electro- magnetic-field generators. Wayne B. Jonas is the tall, athletic- looking, 41-year-old head of the OAM. His job —and that of about a dozen oth- er NIH employee...

Ngày tải lên: 12/05/2014, 15:15

... mil- lion person-days of restricted activity, 65 million person-days of chest discom- fort, 100 million person-days of head- ache, 120 million person-days of cough- ing, 180 million person-days ... Ross 28 SCIENTIFIC AMERICAN October 1993 BUGS INSIDE BUGS: Raœl J. Cano and an amber-clad, bacteria-laden insect. STEVE STARR SABA Copyright 1993 Scientific American, Inc. O ne might expec...

Ngày tải lên: 12/05/2014, 14:50

... 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 Scientific American, Inc. would still be detectable in the existing universe. D espite ... DNA POWERED, HEAVIER- THAN-AIR FLIGHT THEORY OF RELATIVITY COMMUNICATIONS SATELLITE TRANSISTOR Copyright 1994 Scientific American...

Ngày tải lên: 12/05/2014, 14:58

... 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

... diphtheria-tetanus-pertussis and mea- sles-mumps-rubella are required for public school ad- mission. The chicken pox vaccine may join the list. JOHN CHIASSON Gamma Liaison Copyright 1995 Scientific American, ... Liaison DAN BURTON Copyright 1995 Scientific American, Inc. keen appreciation that magnetic con- taminants were common in the labora- tory. They could even be traced to fac- to...

Ngày tải lên: 12/05/2014, 15:02

... large ground- based detectors, which overcome the problem of low flux by watching enor- Cosmic Rays at the Energy Frontier Scientific American January 1997 47 10 10 10 12 10 14 10 16 10 18 10 20 RELATIVE ... balloons have cir- cled the continent for 10 days. One of us (Swordy) is collaborating with Diet- rich Müller and Peter Meyer of the Uni- versity of Chicago on a 1 0- sq...

Ngày tải lên: 12/05/2014, 15:20

... Mobility60 Scientific American October 1997 0 10 20 30 40 50 60 70 80 90 100 100 10, 000 100 ,000 AVERAGE INCOME PER PERSON (1985 U.S. DOLLARS) SHARE OF TRAFFIC VOLUME (PERCENT OF PASSENGER-KILOMETERS) 1,000 WESTERN ... organi- zations. Within those top-level do- mains, second-level identifiers distin- guish types of organizations. This thoughtfully structured system has been stable...

Ngày tải lên: 12/05/2014, 15:30

... SMITH MICHAEL CRAWFORD Copyright 1997 Scientific American, Inc. News and Analysis32 Scientific American November 1997 I ’ve got 10 kids out in the Gulf to- day diving,” says Lt. Commander Robert ... and dracun- culiasis (guinea worm), in which ingested larvae mature inter- nally and eventually burst through the skin. Water-related ill- nesses are also spread through food, hand-to-mou...

Ngày tải lên: 12/05/2014, 15:31

... Technology Ronald L. Rivest 95 98 106 110 116 1100 100 010 10 1100 1 0101 1001 100 0100 1 OF MESS GE KEY CIPHER Molecular prescription (page 17) Copyright 1998 Scientific American, Inc. of many smaller ... illustrated scientific articles, current issue highlights, ask the editors, our on-line store, subscrip- tions, e-mail, and other features not found in Scientific American,...

Ngày tải lên: 12/05/2014, 15:47