I guess you're referring to the uncertainty principle, but this one is more related to the observer effect[1] (also described by Heisenberg): Observing a system

I guess you're referring to the uncertainty principle, but this one is more related to the observer effect[1] (also described by Heisenberg): Observing a system alters its state. In terms of software, it describes bug that change their behaviour (usually vanish) when being investigated. The reason is often a racing condition that swaps to one side due to blocking one thread through a debugger or additional delay through print statements. [1]: https://en.wikipedia.org/wiki/Observer_effect_(physics) https://en.wikipedia.org/wiki/Observer_effect_(physics)