The gas xenon, like the other noble, or inert, gases, is known for doing very little. The class of elements, because of its molecular structure, don’t typically interact with many chemicals.

Breathe easy — researchers say they may have found an innovative approach to treating Alzheimer’s disease. There is no cure for the brain disorder, which affects more than 6 million Americans. Treatment progress has been slow because scientists don’t fully understand what causes the complex disease.