In quantum mechanicswhich deals with the behavior of very small objects, it is not possible to observe a system without changing the system, and the "observer" must be considered part of the system being observed.
Mekanika kuantum: Ring mekanika kuantum, sané mapaiketan sareng parilaksana objek wantah alit pisan, nénten prasida pacang nyelehin sistem tan panguwah sistem, miwah "panyeleh" patut kaangkenin pinaka pahan saking sistem sané kaselehin.