Scientists say they have solved a crucial puzzle about the AIDS virus after 20 years of research and that their findings could lead to better treatments for HIV.
British and U.S. researchers said they had grown a crystal that enabled them to see the structure of an enzyme called integrase, which is found in retroviruses like HIV and is a target for some of the newest HIV medicines.




Two senior officers - one the commander of the Gaza ground operation, no less - were reprimanded for failing to follow their own rules of engagement.
Just 19 countries out of 193 have sent letters of intent to the United Nations to be part of a global climate change accord, the UN's climate chief says.
Rhodes is among a small cadre of senior non-commissioned officers and officers who're opening up about their journeys back from the brink of suicide — efforts that top military commanders applaud as they battle a suicide epidemic.
The last chance for victims of the bloody Nisoor Square shootings to have their day in court may rest on a Charlotte firm's lawsuit accusing Blackwater of reckless conduct in Iraq.





























