Kinesin is an individual cellular motor made of just four protein chains that senses, navigates, makes decisions, and walks with two feet, step by step like a human. It picks up a variety of cargo, such as vesicles, mitochondria, molecular complexes, or messenger RNA and walks, one deliberate step at a time, along a highway of protein cables toward a precise destination. Walking upright on two legs is rare in nature—humans, ostriches, penguins, kangaroos, and a few others—e