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Your search has returned 18 articles:
  • News

    Fellowships awarded to Science News writers

    As we scramble to put out the issue of Science News each week, there's little time for reflection. Fellowships, which generally last a week to a year, can give our writers a broader perspective on the fields that they cover. Two Science News writers have recently received prestigious fellowships. In addition to providing valuable opportunities for the individual writer, these awards indicate...

    05/29/2003 - 11:43 Humans & Society
  • News

    Eggs and more grown from mouse stem cells

    In a series of recent experiments, scientists have transformed cells from mouse embryos into skin, heart muscle, and even eggs. In addition to providing insight into how such tissues develop, these feats have renewed the political and ethical debate over whether similar experiments should be conducted with cells derived from human embryos.

    Known as embryonic stem cells, the lab-grown...

    05/29/2003 - 11:34
  • News

    Vermiculite turns toxic

    Most people know vermiculite as that foam-like mineral that gets mixed into potting soil or poured into attic spaces as lightweight insulating pebbles. Last week, the Environmental Protection Agency and the federal Agency for Toxic Substances and Disease Registry issued a joint warning about vermiculite: If it's a decade or more old, it may be laced with asbestos, a potent lung carcinogen....

    05/28/2003 - 16:15 Earth & Environment
  • News

    To contain gene-altered crops, nip them in the seed

    Canadian researchers have demonstrated that, in principle, they can engineer genetically modified (GM) crops to be incapable of breeding with conventional crops or wild relatives. The new approach could help contain the unintended spread of artificial traits, which is a major source of public concern about GM crops.

    Although several alternative strategies for such containment exist, "...

    05/28/2003 - 15:36 Earth & Environment
  • News

    Uncovering a prime failure

    Mathematicians have returned to the drawing board after what looked like a dramatic step forward in understanding prime numbers–those whole numbers divisible only by themselves and 1. Daniel A. Goldston of San Jose (Calif.) State University and Cem Y. Yildirim of Bogazii University in Istanbul have acknowledged a flaw in work they announced in March, which appeared to say that tight clusters...

    05/28/2003 - 15:29 Numbers
  • News

    Humanity's pedestal lowered again?

    People and chimpanzees share an even closer genetic kinship than is usually assumed, according to a new study. So close is the connection that living chimp species belong to the genus Homo, just as people do, contend Morris Goodman of Wayne State University in Detroit and his colleagues. Until now, chimps have been classified in a separate genus, Pan.

    Genetic analyses also indicate that...

    05/28/2003 - 15:15 Anthropology
  • News

    Gene therapy thwarts hepatitis C in mice

    Gene therapy that induces infected liver cells to self-destruct slows hepatitis C dramatically in mice, scientists report.

    Christopher D. Richardson of the Ontario Cancer Institute in Toronto and his colleagues implanted human liver cells into mice and infected the animals with the hepatitis C virus. The researchers then gave the mice three injections. Some got a self-destruct gene...

    05/28/2003 - 15:07 Biomedicine
  • News

    Taking a shine to number 100

    Scientists have for the first time literally shed light on properties of the radioactive element fermium–a metal discovered some 50 years ago.

    Spectroscopy, or the measurement of the wavelengths of light that materials emit or absorb, is a standard way to probe characteristics of materials, including what energy levels their electrons can assume. However, spectroscopy of...

    05/28/2003 - 14:52 Physics
  • Feature

    Reflections on Art

    Like a defense lawyer in court, David G. Stork was eager to know whether his closing argument was winning over his audience. Would a jury vote to convict? Stork asked the group assembled at NASA Goddard Space Flight Center early this month. None of the of the 100 or so people in the Greenbelt, Md.–facility raised a hand–just the response that Stork, chief scientist of Ricoh Innovations in...

    05/28/2003 - 14:39 Physics
  • News

    Light Switch: Crystal flaws tune the wavelengths

    By exploiting a defect in a semiconductor's crystal structure, researchers have come up with a potentially inexpensive way to make fast fiberoptic communications components. That development, in turn, might speed the long-awaited extension of optical networks into homes, says Janet L. Pan of Yale University.

    Working with gallium arsenide, the primary material from which...

    05/28/2003 - 14:15 Physics