The Quantum Entanglement of the Universe

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In a typical human body, a radioactive decay happens about 5,000 times per second. So am I triggering multiple universes just by standing here? These quantum entanglements are quite common events. When the universe splits, the two universes it splits into aren't as big as the original universe. In a very precise mathematical sense, they're both thinner.

The film Everything Everywhere All at Once won the 2023 Academy Award for Best Picture. In this episode from March 2023, just before the Oscars, Ian Sample spoke to the theoretical physicist and philosopher Sean Carroll about why we seem to be drawn to the idea of multiple worlds, and what the science says about how the multiverse might actually work. Help support our independent journalism at theguardian.com/sciencepod