Hi guys, I'm a newbie in quantum physics and it has blown my mind so far. I feel a bit confused because it seems very unintuitive, but I'm ready to learn more and I need some help on this forum. I have few questions. 1) I red that the wavefunction of an electron is spread all over the universe, so there's a probability that we can find the electron basically everywhere. How do physicists do the measurement to determine the position of an electron since on the common sense view it seems that they should eliminate every portion of space without the electron to find it? Any normal description? 2) How do we know that electrons interact with other stuff in everyday life (like air) since they can be anywhere so we can't specify the place of the interaction and by that the interaction itself? 3) I also red that the interaction between the electron and other things causes the electron to decohere, and serves as a measurement, so how does this 'real life' measurement differ from the measurement in the lab? 4) Does the electron probability cloud reduce when in interaction with other stuff, so for instance can I say that an electron from the atom in my desk can now be in, let's say, South Africa? It seems pretty confusing. 5)What about the nucleus? In the modern atomic model it is said that the electron doesn't have a definite position, but the nucleus is regarded as almost fixed in position and momentum. What is the uncertainty in position of the nucleus and how can we know where the atom as a whole is? Again, I know that this questions may seem weird but I'm a beginner so thanks in advance for the patience, I hope that some explanation will clear up the mess in my head.