Sean Carroll explains why reality only exists when you look at it #science #quantummechanics

Added: 2026-06-02

[00:00:00]According to the rules of quantum mechanics, I can set up an electron, let's say, in a state where it is neither purely clockwise or counterclockwise, but a superposition.

[00:00:10]And that's not just because we don't know the answer, it's because it truly is both until we measure it. The act of measuring the spin of the electron causes a radical change. It spontaneously collapses from being a superposition to being one or the other.

[00:00:25]You can tell me the probability that that happens, but that's all you can tell me.