image: A passive protein known as KIF5B acts as a stable point from which a nanospring made of DNA is pulled by the molecular motor KIF1A. Similar to regular springs, the more the nanospring stretches, the greater the force applied. In this case, fluorescent markers attached to the DNA spring reveal its extension, enabling researchers to visually track the strength generated by KIF1A's motion. ©2025 Hayashi et al. CC-BY-ND Credit: ©2025 Hayashi et al. CC-BY-ND Inside cells, especially