TIL: ELI5

The Many Worlds Interpretation


Listen Later

Imagine you're about to flip a coin. You know there's a 50-50 chance that it'll land on either heads or tails. Now, what if I were to tell you that after the flip, two realities would be created: one where the coin lands on heads, and another where it lands on tails? This concept of multiple realities branching out based on every possible outcome of an event is the idea behind the Many Worlds Interpretation (MWI) of quantum mechanics.

In simple terms, the MWI suggests that for every decision, event, or action that could have various outcomes, a separate, parallel universe exists for each possible result. These parallel universes collectively form an ever expanding "multiverse." The idea was first introduced by physicist Hugh Everett III in the 1950s as a way to explain the strange behavior of subatomic particles in quantum mechanics.
You see, in the quantum world, particles can simultaneously exist in several states or positions at once, a phenomenon called superposition. But when we try to measure or observe the state of a particle, superposition collapses, and it takes on just one state. The MWI argues that for each outcome we don't see, a separate universe exists where that outcome is the reality.
So, let's say you're faced with a decision to either study for an upcoming exam or go to a party. According to the MWI, there's a universe where you choose to study, and another where you choose to party. Your entire life story in each universe branches out into countless other parallel universes, each stemming from different decisions and outcomes.
Now, this might sound like science fiction, but the Many Worlds Interpretation is actually considered one of the most popular interpretations of quantum mechanics among scientists. It helps address some of the paradoxes and strange behaviors found in quantum physics, like the famous Schrödinger's cat thought experiment. While it hasn't been proven, its mathematical foundations and compatibility with quantum mechanics make it a fascinating and legitimate area of study.
In conclusion, the Many Worlds Interpretation proposes that our single reality is just one of an infinite number of parallel universes, each created by the various outcomes and decisions we face. Whether or not these other worlds truly exist remains uncertain, but the concept provides an intriguing way of interpreting the sometimes bewildering world of quantum mechanics.

...more
View all episodesView all episodes
Download on the App Store

TIL: ELI5By TIL