April 11, 1998 | Volume 153 | Number 15Cover: Can butterflies learn preferences for flower colors or knacks for finding the nectar in certain flowers shapes? Pollination researchers have started to find out. (Credit: Dave Cavagnaro, Fenton Communications, Washington, D.C.)
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News of the Week:
Greenhouse Warming Hurts Arctic Ozone
Atmospheric warming in coming decades could delay the recovery of Earths ozone layer.
Drug prevents some cancer, poses risks
While tamoxifen can halve the risk of breast malignancies in cancerfree women, it also poses some serious risksat least in women over 50.
Bacteria cause plague in coral reef
Researchers have identified the bacterium causing an unusually virulent coral disease.
Carotid surgery comes with complications
A common operation to reduce blockage in the carotid artery carries greater risks of stroke than previously thought.
Tiny bioreactors speed up enzyme reaction
Spherical clusters of polymer molecules in a mixture of water and supercritical carbon dioxide can act as reaction vessels for enzymes.
Mutualisms seen as partnerships for barter
A century-old economic model may help ecologists understand how two species can develop a mutually beneficial relationship.
Internal fight settles size of body parts
By preventing the growth of butterfly wings and beetle horns, investigators can increase the size of other developing body parts.
Evading quantum barrier to time travel
Quantum effects do not necessarily rule out the possibility of traveling back in time.
Cutting-edge pursuits in Stone Age
Human ancestors made sophisticated stone tools, displayed advanced hunting skills, and created symbolic artwork at least 200,000 years ago in the Middle East.
New light on ancient smokers
A chemical analysis pushes back direct evidence for tobacco smoking by Native Americans to between 1715 B.C. and A.D. 105.
Gene therapy for breast, ovarian cancer
Hyperactivity of a gene implicated in breast and ovarian cancer was dampened by injections of another gene.
Raspberry-rich diet forestalls cancer in rats
Raspberries are suggested to ward off a cancer of the digestive tract.
Arsenic: A novel cancer remedy?
Low doses of arsenic may prove helpful in treating people suffering from leukemia.
Friends, elephants: Lend me your ears
Elephants appear to use secretions from glands behind their ears to communicate with each other.
Violins varnish makes beautiful music
A violins sweet sound may depend on the wood's finish.
Soap stamps out grease fires
Certain fire extinguishers can smother flames with a foamy layer of soap.
Articles:How Bright Is a Butterfly?
Butterflies may be more capable of learning than pollination biologists have thought.
Electrons in Boxes
Physicists find surprises when they probe the behavior of electrons inside tiny semiconductor structures called quantum dots.
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