You can't Google it because that changes the definition.

it's really annoying how bad this experiment is explained to the general public. the wording generally used is so poor it implies there's something supernatural about the phenomenon

I'm not a physicist, but as far as I understand the principle, any human actively looking at the experiment changes absolutely nothing. what it really postulates is that light behaves as a wave until it is interacted with. at that point, the wave "collapses" and it starts to behave as a particle, positioned somewhere within the probability zone described by the wave initially. when you measure it in any way, using some measuring tool, it inevitably interacts with it

Double slit experiment