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Articles in Dec 10, 1988 issue of Science News

• Chemistry ties CFCs firmly to ozone hole - chlorofluorocarbons
  by Janet Raloff
• Tretinoin: lasting results, lingering doubts - Retin-A
  by Kathy Fackelmann
• New process cleans NOx-ious air
• Ancient human ancestors got all fired up - earliest evidence of fire use uncovered in South African cave
  by Bruce Bower
• Sulfur-climate link called insignificant
  by Charles Knox
• Silicone breast implants on trial
• Minor planet rediscovered after 77 years - HAPAG
• Meeting of mantle, core no longer a bore
  by Richard Monastersky
• Solar Max spots sixth sun-grazing comet
  by Jonathan Eberhart
• For unheard-of success, just add water - ring-opening metathesis polymerization
• Pioneer 6 revisits earth
• Shadow matter and 'black widow' pulsars - PSR1957+20
  by Ivars Peterson
• High-tech tooth repair: incisive software may allow dentists to stop worrying about making a good impression
  by Rick Weiss
• These turtles freeze, but that's okay
• Plants poised at extinction's edge
  by Ingrid Wickelgren
• Ferrets, looking loudly, hear the light - research on brain function
  by Rick Weiss
• Vitamins may reduce neural tube defects
• Trashing earth's radiation belts - space trash