August 9, 1997 | Volume 152 | Number 6
Four alien worlds -- the large moons of Jupiter known as (top to bottom) Io, Europa, Ganymede, and Callisto -- are revealing their distinctive personalities. Data recorded by the Galileo spacecraft are providing new evidence that the tug-of-war between these moons and Jupiter has profoundly affected the moons' evolution. This composite image includes a snapshot of Callisto taken by Voyager in 1979 and photos of the other moons from Galileo's current mission (Image: NASA/JPL)
MathLand TimeLine Food for Thought The Mystery Box
New images taken by the six-wheeled rover on Mars provide the first clear evidence that windblown sand has gouged rocks on the Red Planet.
Two proteins may help transplants
Research in monkeys indicates that two genetically engineered antibodies may protect transplants from rejection.
PCBs linked to rise in lymph cancers
Exposure to PCBs--and perhaps a virus--may explain the skyrocketing growth of a potentially lethal cancer, non-Hodgkin's lymphoma.
Staying alive: Cell protein guards cancers
To stop themselves from committing suicide despite mutations, cancer cells make a protein not normally produced by adult tissues.
Women's brains present hormonal mystery
Women who experience temporary declines of an ovarian hormone successfully solve complex problems although they no longer exhibit the brain response previously linked to success on such tasks, a research team reports.
Newfound worm's world under the sea
Deep sea deposits of hydrates, crystallized structures of water and hydrocarbon gases, are home to a previously unknown, pink, many-legged marine worm.
Finds undermine dating of early land life
A discovery in Greenland may rewrite the history of vertebrates' earliest ventures from the water onto land.
Communism in trees goes underground
Trees transfer carbon to their neighbors, according to their needs, via an underground fungal network.
BiomedicineDetecting heart defects prenatally
An ultrasound exam after week 18 of pregnancy greatly improves doctors' ability to detect heart defects in the fetus.
Blood carries HIV from mouth to mouth
The AIDS virus in blood from a man's diseased gums may have infected his female partner when they kissed.
BiologyBiological control for deer ticks
A symbiotic combination of roundworms and microbes may provide effective biological control for the deer ticks that spread Lyme disease.
Diversity in tropical forest edges . . .
The expansive edge habitat that borders tropical rain forest may be an incubator of biological diversity.
. . . and tropical forest soils
DNA analysis of the soil of Amazonian forests reveals a mother lode of diverse and novel bacteria.
ChemistryCloaked blood hides from immune system
Masking the surface of red blood cells may keep people with chronic blood disorders from becoming oversensitive to frequent transfusions.
Another way to search for new drugs
A technique combining test-tube chemical synthesis with the machinery of an enzyme provides an efficient means to create novel molecules that may be useful as antibiotics.
MathematicsAn enormous chunk of pi
The number pi has been computed to a record 51 billion decimal digits.
Lava lamp randomness
The meandering blobs of a Lava lamp serve as the starting point for a computer to generate a string of random numbers.
Galileo Explores the Galilean Moons
Tidal tugs sculpt Jovian satellites
Data gathered by the Galileo spacecraft is providing new evidence that the gravitational tug-of-war between Jupiter and its four large moons has had a profound influence on the evolution of these satellites.
The Ties That Bond
Adult romantic and sexual styles may grow out of parent-child affiliations
The ways in which grown-ups play the mating game reflect psychological approaches to attachment that take root during infant-caregiver relationships.
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