From VOA Learning English, this is SCIENCE IN THE NEWS. I'm Mario Ritter.And I'm Jeri Watson. Today we tell about an experimental way to cure drug dependency in rats.We also tell about a health threat to one third of all adults. We have a report on a gene that controls the ability of the heart to repair itself.And we report on a competition for researchers with expertise in neurobiology.Recently, researchers reported they were able to end drug-seeking behavior in rats addicted to cocaine.They said they did this with laser light by activating a part of the animals' brains known as the prefrontal cortex.Cocaine is used widely as a drug. It comes from a substance, an alkaloid, in the coca plant.