Date Time Clocking movement of electrons inside an atom Ultrafast science is pursued at the Technical University of Munich (TUM). An international consortium of scientists, initiated by Reinhard Kienberger, Professor of Laser and X-ray Physics several years ago, has made significant measurements in the femtosecond range at the U.S. Stanford Linear Accelerator Center (SLAC). X-ray free-electron lasers (XFELs) have delivered intense, ultrashort X-ray pulses in the femtosecond range for over a decade. A femtosecond is equivalent to a millionth of a billionth of a second. One of the most promising applications of XFELs is in biology, where researchers can capture images down to the atomic scale even before the radiation damage destroys the sample. In physics and chemistry, these X-rays can also shed light on the fastest processes occurring in nature with a shutter speed lasting only one femtosecond.