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Fruits and veggies grown organically show significantly higher levels of cancer-fighting antioxidants than conventionally grown foods, according to a new study of corn, strawberries and marionberries. The research suggests that pesticides and herbicides actually thwart the production of phenolics — chemicals that act as a plant’s natural defense and also happen to be good for our health. Fertilizers, however, seem to boost the levels of anti-cancer compounds.

The findings appear in the

Scientists with the U.S. Department of Energy’s Joint Genome Institute (JGI) and the Lawrence Berkeley National Laboratory (Berkeley Lab) have developed a powerful new technique for deciphering biological information encoded in the human genome. Called “phylogenetic shadowing,” this technique enables scientists to make meaningful comparisons between DNA sequences in the human genome and sequences in the genomes of apes, monkeys, and other non-human primates. With phylogenetic shadowing, scientists c

University of Colorado at Boulder researchers have conducted the most sensitive search to date for gravitational-strength forces between masses separated by only twice the diameter of a human hair, but they have observed no new forces.

The results rule out a substantial portion of parameter space for new forces with a range between one-tenth and one-hundredth of a millimeter, where theoretical physicists using string theory have proposed that “moduli forces” might be detected, according to

Forget sharp metal picks or X-rays-in the future, your dentist may search for cavities using a painless laser-based technique developed at U of T that can detect cracks or defects at an early stage of development. v “Using the technique, we can see all the way to the pulp-more than five millimetres inside a tooth,” says Professor Andreas Mandelis of U of T’s Department of Mechanical and Industrial Engineering. “It can reveal suspicious regions invisible to the naked eye below the surface of

In the years after the American Revolution, U.S. presidents were talking about the British a lot, and then about militias, France and Spain. In the mid-19th century, words like “emancipation,” “slaves” and “rebellion” popped up in their speeches. In the early 20th century, presidents started using a lot of business-expansion words, soon to be replaced by “depression.”

A couple of decades later they spoke of atoms and communism. By the 1990s, buzzwords prevailed.

Jon Kleinberg, a p

Scientists work toward unraveling gene expression in the brain

Using Web-based tools they developed to sift through reams of data, scientists from the Kennedy Krieger Institute and Johns Hopkins hope to unravel the genetics of neurological problems associated with Down syndrome, autism and lead poisoning.

Their search starts with microarrays, or so-called “gene chips,” which measure the activity of tens of thousands of genes all at once. By analyzing the pattern of gene acti