The double-slit experiment’s interference patterns suggest something is in two places at once. Detractors ask how it’s possible to justify this constant proliferation of worlds, and how, in a many-worlds framework, you can explain why measuring quantum systems yields probabilities, given that there are always definite outcomes in each world. From the archive: hay fever, and the transit of Venus across the SunFrom the archive: ancient timelines and a west-side story of citiesFrank Shu (1943–2023)Towards quantum machine learningQuantum computers: what are they good for?Rewriting the quantum-computer blueprintTowards quantum machine learningQuantum computers: what are they good for?Rewriting the quantum-computer blueprintCMLR's goal is to advance machine learning-related research across a wide range of disciplines