The Nobel Committee has awarded the 2023 Nobel Prize in Physics to Pierre Agostini, Ferenc Krausz, and Anne L’Huillier for experimental methods that generate attosecond pulses of light — flashes that last for one-quintillionth of a second. Such fleeting flashes of light open the door to observing the motion of electrons in atoms. “The ability to generate attosecond pulses of light has opened the...