News
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Why is that wasp helping?
Researchers have found nests of a social insect with helpers that are neither close kin nor slaves.
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Weevils pick on someone their own size
A horned weevil can't pick a real fight with a male too big for him because the bigger one can't get a good grip.
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Trilobites might have invented farming
A close look at fossils raises the possibility that a type of trilobite farmed bacteria.
- Health & Medicine
Heart risks linked to infertility syndrome
Women with polycystic ovaries—commonly linked to infertility—are more likely than women without the disease to show early signs of heart disease.
- Health & Medicine
Being a dad comes naturally
Men whose wives are about to give birth show hormonal fluctuations that may predispose them to better parenting behavior.
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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.
- Planetary Science
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.
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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.
- Materials Science
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.
- Health & Medicine
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.
- Agriculture
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.
- Health & Medicine
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.
