Unraveling the inner structure of a nucleus Investigators are using fluorescent tags to illuminate the organization of chromosomes inside a cell's nucleus. The death rate for heart disease dropped 34 percent between 1980 and 1990, and half of that drop resulted from improved surgical and drug treatment and the rest from lifestyle changes. A new direction for microgravity fires Flames in space behave in unexpected ways, including burning into a breeze and smoldering in strange patterns. No laughing matter An allergy to proteins in seminal fluid is more common than previously suspected. The question of regular mammograms An advisory panel declines to recommend regular mammograms for women in their forties.
Paths can be a significant source of soil loss in tropical rainforests.
Crab Crackers Scientists take a harder look at stone crab shells The light and dark parts of a stone crab's huge claws reflect differences in the microstructure and strength of the constituent materials.