We've all seen those bathtub refinishing ads that promise a glossy new surface on the dingy old tub.

But a solvent used to make that transformation has killed at least 13 people who used it to strip bathtubs from 2006 to 2011, according to a new study. The chemical, methylene chloride, is sold as a solvent and paint stripper both to professionals and in dozens of do-it-yourself products sold at home improvement stores.

Computer chip makers have long struggled to build ever-smaller transistors to allow faster, more powerful computers. Writing in the journal Nature Nanotechnology, a team of scientists describes what may be the ultimate limit of that struggle — a transistor made of a single atom. Michelle Simmons, a physicist at the University of New South Wales in Australia and leader of the project, discusses the work.

Connie Johnson is not afraid to be outrageous. The Democratic state senator from Oklahoma has watched in frustration for several years now as colleagues have rammed through bills limiting women's reproductive rights.

She tried debating and making speeches. Finally, earlier this month, she thought of something that made her point more clearly, or at least more graphically.

She introduced an amendment that would define life as beginning not at conception, but "ejaculation."

Occupy Wall Street tells The Associated Press that a national conference being planned in Philadelphia this summer was not approved by its General Assembly, meaning the group does not endorse it.

The news that some rice-based foods are surprisingly high in arsenic has left rice lovers wondering how the heck we're to know what's safe to eat.

Since Dartmouth College researchers reported last week that a toddler formula and energy bars sweetened with organic brown rice syrup tested high for arsenic, readers of The Salt have had lots of questions about how one might find out the arsenic content of rice-based foods, and figure out what's safe.

The Oglala Sioux Tribe filed a $500 million lawsuit against brewers and retailers, claiming they're responsible for the reservation's alcohol-related problems. The tribe lives on a dry reservation, but they claim nearby towns unlawfully sell alcohol to residents. Host Michel Martin speaks to a reporter and the tribe's attorney.

A new case taking on affirmative action in higher education is set to be heard in the Supreme Court this fall. In 2003, the court ruled that universities could consider racial diversity in admissions. But today the make-up of the court is very different. Host Michel Martin discusses the case with two law school deans.

After the explosion of the rocket-propelled grenade on a road in Fallujah, Oscar Canon saw the white of his own thigh bone. At the medical unit, the young Marine sergeant grabbed the doctor by his collar and yelled, "Don't cut off my f***ing leg." That was in October of 2004 and the first of dozens of surgeries — 72 separate operations, by a family member's count — that saved his leg.

Last week, Staff Sgt. Oscar Canon, 29, died. A Marine Corps spokesman at Camp Pendleton says the death is still being investigated.