In a brief, accessible article, John Stewart Bell (1976) describes presenting a thought experiment to his colleagues, which attracted considerable attention at the time. The scenario involved two spaceships, initially at rest and connected by a fragile thread, that begin to accelerate simultaneously and identically as measured in an inertial frame. Although their separation remains constant in that frame, relativistic effects imply that the thread undergoes increasing tension due to length contraction not being experienced by the thread itself. Eventually, confidence led to its breaking. “Is it really so?” Bell asked his colleagues. According to Bell’s account, “a clear consensus emerged that the thread would not break!” (Bell, 1976, 136).