In 1992, Asher Peres and William K. Wootters published a paper studying how much information can be extracted from two identical copies of an unknown quantum state when the parties can only use local quantum operations and classical communication — protocols they call 'ping-pong' — leaving open the question of whether that limit could be surpassed. Charles H. Bennett invites Wootters to present the problem in Montreal; in the audience are Gilles Brassard (who organizes the talk), Richard Jozsa (then his research assistant), and, at Brassard's express invitation, Claude Crépeau. During the talk itself, Bennett poses the question that triggers the breakthrough: 'what difference would it make if the two participants shared an EPR (entangled) pair?' The answer, developed by the six researchers and published in 1993 as 'Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels', demonstrates that an unknown quantum state can be decomposed into purely classical information plus non-classical quantum correlations (of the Einstein-Podolsky-Rosen type), sent through separate channels, and exactly reconstructed at the receiving end — without the original state physically traveling and without it ever being measured or known by either party. The protocol resolves an apparent paradox: the no-cloning theorem forbids copying an unknown quantum state, but teleportation allows it to be reconstructed elsewhere because the original is destroyed in the process of Alice's joint measurement, so that two simultaneous copies never come to exist. The result, experimentally confirmed a few years later by several independent groups, becomes one of the conceptual pillars of quantum information science, with applications in distributed quantum computing and quantum communication networks.