Decoherence acts as the agent protecting our daily-life experience from too much quantum weirdness, resolving the conundrum of how classical experience emerges in a quantum measurement. Whenever a quantum system is measured or coupled with its environment, entanglement causes the quantum system, the observer, and the rest of the universe to become interwoven with each other. Consequently, from the perspective of the local observer, who can’t oversee the entire universe, information is dispersed into her unknown environment.
