The second phase of a major upgrade project is now online at the Linac Coherent Light Source (LCLS), the pioneering X-ray free-electron laser at Department of Energy's SLAC National Accelerator Laboratory. On September 12, scientists ushered an electron beam through a new undulator to produce "soft" X-rays. This follows the upgraded facility's first light in July, produced with another undulator that generates "hard" X-rays.