For scientists who come from abroad to live and work in America, accents can be personal. It's discouraging to be misunderstood, even when they think they’re speaking clearly. Sometimes, it could even be a career liability. Is the problem the accent, or those on the receiving end?

Residents of Lebanon's Beqaa Valley say pollution in the Litani River is responsible for a host of chronic health problems. While a causal link is hard to prove, cleanup efforts are precarious amid the country's economic crisis and shifting blame between refugees and government inaction.

Alkaline hydrolysis is an end-of-life option that’s gaining popularity in Canada and the U.S. It’s marketed as a greener form of cremation — a way to still end up with ashes, but without sending harmful emissions into the air. But getting the technology approved by lawmakers has proven difficult.

When Pervis Payne was sentenced to death more than three decades ago, it was permissible to execute someone with an intellectual disability. A Supreme Court decision changed that in 2002, but Payne's disability was acknowledged only last year. Why did it take so long to remove him from The Row?

Urbanization in Lagos, Nigeria, is moving at a rapid clip — burying mangrove forests and wetlands under mounds of sand to make way for wealthy subdivisions. Without strong regulations around how that sand is harvested, the social, economic, and environmental consequences are vast.

Scientists and counterterrorism experts believe understanding the underlying motivations of radical extremists will help them deradicalize people. Now, one group has studied the brain activity of active extremists after asking them to contemplate the values they are willing to fight and die for.

In December of last year, Congress passed legislation that gives the Environmental Protection Agency authority to phase out most hydrofluorocarbons — potent greenhouse gases that keep refrigerators cool — over the next 15 years. But there's no perfect alternative to replace them.

Twenty years ago Portugal decriminalized all drugs as part of a bigger national strategy to fight addiction. Last month Oregon became the first U.S. state to do the same, in a policy modeled off Portugal’s approach — but many questions about how success may translate remain unanswered.