In this issue:
"The Amazing Teen Brain": Rapidly changing wiring leads to mental agility – and risky behavior.
"All the Light There Ever Was": Galaxies in every corner of the universe have been sending out photons, or light particles, since nearly the beginning of time. Astronomers are now beginning to read this extragalactic background light.
"Cells on Fire": A newly discovered structure in cells underlies inflammation wherever it occurs—an insight that may lead to new treatments for ailments as diverse as atherosclerosis, Alzheimer's and fatty liver disease.
"Birth of a Rocket": Is NASA's Space Launch System a flying piece of congressional pork or our best shot at getting humans to deep space?