Scientists reported new evidence Wednesday that supports a provocative theory about cancer.
Three separate teams of scientists said they had, for the first time, shown that so-called cancer stem cells can be found naturally in brain tumors and early forms of skin and colon cancer.
Evidence has been mounting in recent years for the existence of these cells, which would be especially insidious. They are believed to resist standard chemotherapy and radiation and fuel the growth of tumors and relapses.
When I say citius, you say altius; when I say altius, you say fortius. Or don't. That's fine, too, traditional even. But these Olympics have conspicuously defied traditional notions by having cheerleaders, in a few different styles, at a few different venues. In basketball, dance teams perform between matches. In beach volleyball, highly choreographed teams delight attendees.
The Internet is slowly becoming a less anonymous place. YouTube has a new policy encouraging commenters to use their real names, and many news sites have switched to a login system run by Facebook.
News sites that still allow anonymous comments are finding there are legal risks. The Spokesman-Review newspaper in Spokane, Wash., has spent the last few months trying to protect the identity of a reader who saw a photo of a Republican Party official in Idaho named Tina Jacobson, and then posted a disparaging comment.
Republican presidential candidate Mitt Romney says America's national security priority should be preventing Iran from acquiring a nuclear weapon, and he was talking tough about this in his recent stop in Jerusalem.
"History teaches with force and clarity that when the world's most despotic regimes secure the world's most destructive weapons, peace often gives way to oppression, to violence, or to devastating war," Romney said. "We must not delude ourselves into thinking that containment is an option."