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The FDA says pet owners should watch out for vitamin D toxicity. Recalled brands include Abound, Nutrisca and Natural Life.

The company is holding a contest to find a new and natural, low-calorie sweetener. The challenge comes at a time when many Americans are cutting back on sugar due to obesity and diabetes risks.

The nuclear industry is struggling with aging plants and competition from cheaper natural gas. Now, touting itself as another form of "clean" energy, it's lobbying state lawmakers for help.

An art installation in Perth, Australia, seeks to extend the musical output of the late experimental composer Alvin Lucier, and asks interesting questions about the nature of creativity.

NPR's Michel Martin speaks with reporter Taylor Lorenz about a troubling trend among some young social media users: the self-diagnosis of mental health issues.

Adam Frank was a contributor to the NPR blog 13.7: Cosmos & Culture. A professor at the University of Rochester, Frank is a theoretical/computational astrophysicist and currently heads a research group developing supercomputer code to study the formation and death of stars. Frank's research has also explored the evolution of newly born planets and the structure of clouds in the interstellar medium. Recently, he has begun work in the fields of astrobiology and network theory/data science. Frank also holds a joint appointment at the Laboratory for Laser Energetics, a Department of Energy fusion lab.

Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.

Victor Hanson has grounded his life in the study of the classics and in the land his family has farmed for six generations. By following in the footsteps of his ancestors, he believes he is never alone.

Olympic gold medalist Dominique Moceanu, an early critic of abusive behavior in the USA gymnastics program, talks to NPR's Michel Martin about recent reporting on the sport's widespread sexual abuse.

Human activity is rapidly changing our environment, and there are some surprising consequences. Take the deforestation of rainforests — which destroys local ecosystems but also affects the weather.