Scientists have long sought to refine our understanding of nonlocality and the foundations of quantum mechanics. A new study by G. Bacciagaluppi, R. Hermens, and G. Leegwater challenges a key assumption underpinning Bell’s theorem, Measurement Independence, the idea that measurement settings are independent of hidden variables. The researchers demonstrate that violations of this assumption, similar to violations of locality, could in principle allow for signalling, making them experimentally testable. By imposing the constraint of no-signalling, they derive a version of Bell’s theorem that circumvents the need for Measurement Independence, offering a potentially more robust framework for exploring the limits of quantum theory and its implications for ‘experimental…