Hi everyone. Very orderly forum you have here. I'd like to ask a few philosophical questions which are very fundamental to QM. Firstly I assume we all agree that a fundamental particle - imagine an electron or quark - has multiple inherent properties which are all separable from each other, such as its kinetic energy, its mass, its spin direction, its charge, its colour and flavour (quarks), and their frequency (and perhaps others, please point them out if there are any). It seems to me like very few of these can actually change for any individual particle. Charge never changes. Colour, flavour and spin direction can change within a few very restricted values, due to direct actions performed on the particle by gauge bosons. Mass can only change as the particle approaches the speed of light (or enters very distorted space-time?). So my first question is: is it really true that the only values here that can continuously change are kinetic energy (and thus velocity) and frequency? And that the things that cause those changes *are* the unchangeable static properties of *other* particles? Hence the charge and mass of an electron act together upon the body of a different electron to change that electrons velocity? Another question I have is how frequency and velocity relate to energy: is it the case that a particle has a "pure" energy, aside from its kinetic energy, which solely determines the particles frequency, and similarly, is the velocity of a particle determined by the more fundamental kinetic energy? Or does "pure" energy not exist, such that, when an electron or quark absorbs a photon, the photons energy is portioned into specific categories of energy such as kinetic or entropic/configurational?