scientific american - 1995 01 - warning - digital documents in danger

... 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 ... discarded. (In extreme cases, transla- tio...

Ngày tải lên: 12/05/2014, 15:00

... tips. Copyright 1995 Scientific American, Inc. W hen computer diagnostician Angela Bennett (played by San- dra Bullock) disabled a main- frame computer with a virus-infected disk slipped into a Macintosh in ... com- pletely outside of it.Ó The whirring ma- chine splintered, spewing blood onto the walls, carpets and window, where it merged into the sunset. ÒI screamed again and again. S...

Ngày tải lên: 12/05/2014, 15:02

... chem- istry of life while fending off attacks from soil-dwelling, non-car- bon-based organisms. The key was active watching —stopping the videotape and discussing the concepts; in this way, a single episode ... nonprofit or- ganization based in Pasade- na, Calif., a project called SETI@home. This venture in- vites the public to join in the search for extraterrestrial in- telligence....

Ngày tải lên: 12/05/2014, 15:51

... 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 ... Inc. case, it was my good chance.Ó Levi-Mon- talcini and her family left Turin in 1942 for the surrounding hills and success- fully survived the war in hiding. By con- vincing farmers t...

Ngày tải lên: 12/05/2014, 14:48

... of low doses in drinking water is suspected of contributing to a high rate of human liver cancer in cer- tain parts of China. Copyright 1994 Scientific American, Inc. This Þnding, in turn, raised ... blow or a tooth- ache. HighÞeld and Car- ter note that before the breakup of EinsteinÕs Þrst marriage, the young phys- icist lived with Elsa Ein- stein, a cousin, in Berlin, leaving hi...

Ngày tải lên: 12/05/2014, 14:50

... transglutaminase fuses pairs of in- terleukin-2 molecules into a toxin that selectively kills oligodendrocytes. Her team tested the concept by sev- ering the optic nerves of mice and ad- ministering ... the response to injury,Ó she recalls. That machinery involves an enzyme, called a nerve-derived transglutaminase, and in- terleukin-2, a chemical signal produced by the immune system at s...

Ngày tải lên: 12/05/2014, 14:58

... creatures live in eastern Austra- lia is increasingly be- ing sought by real-es- tate developers. Koalas have come to live cheek-by-snout with people moving into coastal areas pop- ulated with the ani- malsÕ ... Anal- ysis showed that invading is a dicey lifestyle choice. ÒWe determined that, collectively, alien beings in science-Þc- tion Þlms do suÝer from high mortali- 20 SCIENTIFIC...

Ngày tải lên: 12/05/2014, 15:00

... France-Presse Copyright 1995 Scientific American, Inc. A lthough the American population is stabilizing in number, it is bal- looning in mass. The epidemic in obesity continues to spread, now af- ßicting ... CRAWFORD Copyright 1995 Scientific American, Inc. G etting rid of the long-lived, ra- dioactive by-products of nucle- ar power is a problem that has stalked the industr...

Ngày tải lên: 12/05/2014, 15:00

... parking lot toward the ivory-colored administrative tower ris- ing from a complex of low, blocky labs, I imagine the instituteÕs direc- tor staring out the top-ßoor window, morosely pondering the ... ÑSasha Nemecek 26 SCIENTIFIC AMERICAN April 1995 U ntil recently, many medical in- vestigators believed the AIDS vi- rus remains more or less dor- mant in asymptomatic persons, step- pi...

Ngày tải lên: 12/05/2014, 15:00

... MILLION 1 IN 10 MILLION 1 IN 1 MILLION 1 IN 100,000 1 IN 10,000 Odds of any- thing happen- ing to only one person in the world at any time Odds of any- thing happen- ing to only one person in the ... Stix 1 IN 1 TRILLION CHANCE OF AN EVENT OCCURRING 1 IN 100 BILLION Woman be- ing killed by a husband or lover 1 IN 10 BILLION Drowning in a tub Being killed by lightnin...

Ngày tải lên: 12/05/2014, 15:01