News
- Earth
To contain gene-altered crops, nip them in the seed
Researchers have demonstrated that, in principle, they can add genes that block genetically modified crops from breeding with conventional varieties and thus from spreading their artificial traits.
- Math
Uncovering a prime failure
Mathematicians have returned to the drawing board after what looked like a dramatic step forward in understanding prime numbers.
- Anthropology
Humanity’s pedestal lowered again?
A new genetic study reaches the controversial conclusion that chimpanzees belong to the genus Homo, just as people do.
- Health & Medicine
Gene therapy thwarts hepatitis C in mice
Gene therapy that induces infected liver cells to self-destruct slows hepatitis C dramatically in mice.
- Physics
Taking a shine to number 100
Scientists for the first time literally shed light on the properties of radioactive fermium.
- Physics
Light Switch: Crystal flaws tune the wavelengths
By tweaking the crystal structure of the semiconductor gallium arsenide, researchers may have found a way to make cheaper components for fiberoptic networks.
- Health & Medicine
Flawed Therapy: Hormone replacement takes more hits
Elderly women taking estrogen and progestin are more likely to develop dementia, including Alzheimer's disease, and stroke than are women not taking the hormones.
- Astronomy
Red Team, Blue Team: Galaxy survey shows that color matters
Using the largest survey of galaxies ever compiled, astronomers have found that the cosmos divides sharply along color lines.
- Planetary Science
New view of Earth
On May 8, 2003, scientists pointed a camera on board the Mars Global Surveyor probe back at Earth and captured the first image from another planet that shows our world as more than a point of light.
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Memorable Shot: Smallpox vaccine has lasting effect
People vaccinated against smallpox decades ago may retain significant immunity to the virus that causes the disease.
- Agriculture
Mad Cow Future: Tests explore next generation of defenses
As Canadian health officials investigate mad cow disease within the country's borders, researchers are already working on the next generation of defenses.
- Chemistry
Multiple Motions: Applied electrons make molecules vibrate and move
A new technique enables scientists to choreograph individual molecules to vibrate, break bonds, and move on a surface in specified ways.
