Articles from Science News (July 23, 1994)

Title	Author	Type	Words
An immune system for computer viruses.	Lipkin, Richard	Brief Article	269
Antioxidant vitamins fail to prevent polyps.	Fackelmann, Kathy A.	Brief Article	624
By Jupiter! Comet crashes dazzle and delight.	Cowen, Ron		735
Cancer protection: regular or decaf?		Brief Article	250
Exploiting El Nino to avert African famines.	Monastersky, Richard	Brief Article	470
From proteins to protolife: was life's emergence random or guided by determined chemical steps.	Lipkin, Richard		1463
Guiding light: beaming up an artificial star as an astronomical beacon.	Peterson, Ivars	Cover Story	1997
Hot under the collar over dinosaurs.		Brief Article	448
Into every life some UV must fall.		Brief Article	294
Scratching a polymer to guide light waves.	Peterson, Ivars	Brief Article	387
Silicone gel stimulates tumors in mice.	Marino, Gigi	Brief Article	528
Simulated creatures evolve and learn.	Lipkin, Richard	Brief Article	281
Smoking worsens menstrual pain.		Brief Article	296
Stress may take two paths in depression.	Bower, Bruce		600
T. rex discovered in Canada.		Brief Article	113
Tangling over Toronto's ozone.	Lipkin, Richard	Brief Article	267
U.S. adults: a weighty lot.	Adler, Tina	Brief Article	319
Why steel can go snap, crackle, and pop.	Lipkin, Richard	Brief Article	324