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With just 30 vaquitas left, Barbara Taylor, a marine mammal expert, discusses the latest effort to keep the world’s smallest porpoise from going extinct.

Opioid overdose deaths among middle-aged black men have increased 245 percent in the past three years in Washington, D.C.

The Dalai Lama spoke Friday to a crowd of about 25,000 at the University of California, San Diego.

Joel Clement, who was director of the Interior Department's Office of Policy Analysis during the Obama administration, says in a newspaper op-ed that he was reassigned to an "accounting office."

U.S. enforcement officials said they will not change how they treat marijuana under federal drug control laws, turning aside a bid from Democratic governors to loosen restrictions on the substance.

The human elements of the pig embryos were limited, but experts say this study represents a significant first step toward the goal of one day growing human organs in animals.

The colorful, crowded vehicles are a cheap and popular form of public transport. But they also pollute the air. Jeepney drivers have been pushing back against government plans to phase them out.

Despite reports that there may only be 2 or 3 vaquitas left in the northern Gulf of California, a $4 million effort to capture and save the critically endangered porpoise is moving forward.

El Niño events are having a greater influence on ice melting in Antarctica than before, according to researchers at the Scripps Institution of Oceanography.

Airs Wednesday, Nov. 25, 2015 at 10 p.m. on KPBS TV