Hey guys and gals, clearly I'm new here, not only new here but new to QM (relatively speaking). I've read a few threads here pertaining to a thought I've been pondering on but the answer doesn't seem clear. In the Copenhagen interpretation, what qualifies as a "measurement", and/or what qualifies as an "observer"? I ask this because of the alleged seemingly common misunderstanding that the one doing the measurement needn't be sentient because otherwise it would stand to reason that prior to being "measured" by an "observer" the most basic building blocks of matter wouldn't be able to combine and interact due to being in an unstable state of possibilities and never collapsing into a physical point in the universe and well, we wouldn't have a universe. In other words, we'd have no objects in the universe as their components would still be in an unstable state of flux from not being measured because of a lack of sentient beings to measure it. Is it simply the act of an outside "agent", sentient or not, that can collapse a particle's wave function? So pardon the "noob" question, just looking for some clarification. Thanks!