Comments by "Muizz" (@muizzy) on "vlogbrothers" channel.

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  9. Well, when you get so deep in to the science of elementary particles, things get fuzzy, fast. An elementary (also called a point particle) is a particle which has no internal structure, it's not made of anything in the way that protons are made of quarks, it's just that particle. We call a proton a composite particle, these composite particles are far from spatially localized due to the heisenberg uncertainty principle. The wavepacket of the particle always occupies a non-zero volume. With composite particle that isn't really a problem, seeing as that's when you get quantum superpositions of quantum states. An elementary particle however, doesn't have these superpositions or quantum states. Seeing as we describe the size of particles (composite and elementary alike) by the size of its structure, we can define the size of elementary particles to be exactly 0. It doesn't have such a structure because of it's elementary-ness. Experimentally we have found that the radius of an electron is lower than 10^-18 meters (http://cerncourier.com/cws/article/cern/29724 - ctrl+f for electron radius) which falls in line with the value we expect exactly 0 to be. It is extremely difficult to explain these concepts in laymans terms without having you take a course in quantum mechanics. A wave particle duality says nothing about what a particle actually is. All it says is that a particle has properties consistent with both. Wikipedia has a fine article on that concept. (Got to eat dinner so cutting it off)
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