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Gut microbes deserve a lot of credit: They not only help digest our food, produce some nutrients, detoxify harmful substances, and protect us from pathogens--they are also important for the development of the immune system. Disturbances in the gut microbiota have been linked to allergies as well as disorders of the digestive and immune systems . Although intestinal organisms' impact on the digestive system's functioning is generally accepted, how they influence pathologies elsewhere in the body has remained a mystery.

New research has begun to address this enigma. Diane Mathis, professor of pathology at Harvard Medical School , and her colleagues have found that one species of naturally occurring gut bacteria can set off arthritis in mice, in part by manipulating cells of the immune system. Their study appears in the June 25 issue of the journal Immunity .

A new sentry is on guard atop the Haleakala volcano in Hawaii, scanning the skies for potentially threatening asteroids and comets. The first of four telescopes planned for the Pan-STARRS project, short for Panoramic Survey Telescope and Rapid Response System, began a dedicated survey of the sky May 13. [More]

By Zoë Corbyn

Controversial researcher Peter Duesberg has been cleared of wrongdoing following formal complaints made after he and others published a paper arguing that there is "as yet no proof that HIV causes AIDS."

Duesberg, who is well known for denying the link between HIV and AIDS, escaped censure from the University of California, Berkeley, after an investigation upheld his academic freedom and found no clear evidence that he broke faculty rules in publishing the paper.

A letter dated May 28 from Sheldon Zedeck, vice-provost for academic affairs and faculty welfare, to Duesberg effectively clears him of any wrongdoing. [More]

Editor's Note: Haley Smith Kingsland is an Earth systems master's student at Stanford University specializing in science communication. For five weeks she's in the land of no sunsets participating in ICESCAPE , a NASA-sponsored research cruise to investigate the effects of climate change on the Chukchi and Bering Seas. This is her first blog post for Scientific American .

By Jeremy Pelofsky and Kristen Hays

WASHINGTON/HOUSTON (Reuters) - A judge on Tuesday overturned the Obama administration's six-month ban on deepwater drilling, complicating its efforts to improve oil industry safety after the worst oil spill in U.S. history.

A mathematician in Alberta, an oceanographer from the Massachusetts Institute of Technology and a darling of climate change contrarians share a rare distinction in a new analysis of expertise about global warming. The three scientists are the only ones, on the basis of their work, to appear on two lists: both among researchers who are convinced of the scientific evidence for climate change and on a roll of those who are unconvinced. [More]

Spring did not come for the oaks of Martha's Vineyard.

For three years, the residents here watched a stunning outbreak of caterpillars that stripped an oak tree bare in a week, then wafted on gossamer threads to another.

Imagine that the same rechargeable battery in your cell phone could power a device that requires 10 times the energy. That possibility may be closer than you think.

A battery created by researchers at Massachusetts Institute of Technology demonstrated an increased capacity for charge by roughly a third and a power output 10 times higher, for its size, than what is expected of a conventional rechargeable lithium battery . The results were published yesterday in Nature Nanotechnology .

One of the world's most critically endangered species of turtles has been bred in captivity for the first time. In May two baby Batagur baska turtles hatched at Schönbrunn Zoo in Vienna. The zoo, which already held four of the world's 18 known turtles of the species, announced the achievement last week. [More]

By Leslie Gevirtz

As the World Cup races forward in South Africa a different kind of soccer tournament recently kicked off in Asia. And whereas debates in Cape Town and Johannesburg may center on the Jabulani ball's aerodynamics or the vuvuzela's "unique" sound, in Singapore coaches are more likely to worry whether their favorite player has blown a fuse, so to speak. [More]

    If your children are like 99 percent of boys and 94 percent of girls, they play video games . And, if they are like 50 percent of boys and 14 percent of girls, they prefer games with “mature” – read: violent -- themes, such as Grand Theft Auto, an urban dystopia of gun fights, car chases, pole dancers and prostitutes, where blood splatters realistically on the “camera lens.” Should you worry whether such a game will warp your children’s minds? A new paper by Cheryl Olson, a public health specialist at Harvard, suggests the answer may be: au contraire.

Olson surveyed children’s reported motivations for video game playing and found that their top rated choices were to have fun, compete well with others, and to be challenged. She then elaborates on the psychological benefits such play might afford, describing how video games facilitate self-expression, role play, creative problem-solving, cognitive mastery, positive social interactions and leadership. Sounds more utopian than dystopian, right? [More]