This paper by Handel and Tetzlaff analyzes thermal fluctuations in the speed of linear biological motors. The work applies quantum 1/f noise theory and thermal fluctuation analysis to molecular motors such as kinesin and myosin that transport cargo along cytoskeletal filaments, examining how fundamental noise sources limit the speed regulation and efficiency of these nanoscale biological machines, with implications for understanding cellular transport mechanisms and designing biomimetic nanomechanical systems.