July 1st, 2000
issue

  • Human Genome Work Reaches Milestone
    Two rival groups jointly announced that each has read essentially all of the 3 billion or so letters that spell out the human genome, the genetic information encoded with the 6 feet of DNA coiled up in every human cell. (p. 4)
  • Martian leaks: Hints of present-day water
    In some of the coldest regions on Mars, water appears to have recently gushed from just beneath the surface, running down crater walls and steep valleys. (p. 5)
  • Prenatal problems linked to schizophrenia
    Three large, long-term studies found that periods of oxygen deprivation in the fetus, along with obesity and second-trimester respiratory infections in the mother, are associated with adult schizophrenia. (p. 6)
  • Conch yields clues for future materials
    A conch's tough, calcium carbonate shell resists fractures because a protein surrounds the mineral crystals throughout the shell. (p. 6)
  • Do liver stem cells come from bone marrow?
    Tests of liver tissue from people who've received liver or blood-marrow transplants show that stem cells in bone marrow can populate the liver as liver cells. (p. 7)
  • Carnivorous fish nibble at farming gain
    Fish farming may ease pressure on wild stocks overall, but for certain species, farms mean a net loss of fish. (p. 7)
  • Raising Trust
    Some forager groups may nurture a sharing sense in their offspring. (p. 8)
  • The Case for DDT
    What do you do when a dreaded environmental pollutant saves lives? (p. 12)
  • The medicine isn't going down
    Only about a third of people diagnosed with type II diabetes are taking their medications often enough to keep their blood sugar concentrations under tight control. (p. 11)
  • Darn that diet, anyway
    Seemingly healthful foods—such as broiled chicken and baked fish—can contain high concentrations of compounds that may damage the cardiovascular system, and eating these foods can raise the concentration of these so-called advanced glycation end products in a person's blood. (p. 11)
  • Singing the blues
    After finding that people with diabetes are slightly more likely to have had an episode of depression in the past 11 years than similar people who have not developed diabetes, some researchers have made the controversial suggestion that depression may cause diabetes. (p. 11)
  • Lifestyle can prevent diabetes...maybe
    Losing weight and exercising more can help ward off diabetes—but other research suggests that it's hard to get people to make such lifestyle changes. (p. 11)
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