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<blockquote data-quote="StevenBensics" data-source="post: 2555704" data-attributes="member: 870686">Two Questions. I&#039;ve been studying some quantum mechanics online.Having studied chemistry, I understand &quot;charge,&quot; for protons, neutrons, electrons and ions and such, but what exactly is &quot;spin&quot; for sub-subatomic particles (quarks and such)? How can they have values like +1/2 and -1/2 and such? What are they a measure of?Also, do gluons travel backwards in time? I found something called a Feynman Diagram. It&#039;s a Cartesian plot with spatial position in the y-axis and time in the x-axis. Apparently, when a positron and electron collide, they annihilate and form a single gamma ray, which then splits off into a quark and antiquark. But the antiquark shows a coiled path of a gluon splitting off it with loops that go backward in time. So I&#039;m wondering, do gluons travel backwards in time? How is that possible?</blockquote>

[QUOTE="StevenBensics, post: 2555704, member: 870686"] Two Questions. I've been studying some quantum mechanics online. Having studied chemistry, I understand "charge," for protons, neutrons, electrons and ions and such, but what exactly is "spin" for sub-subatomic particles (quarks and such)? How can they have values like +1/2 and -1/2 and such? What are they a measure of? Also, do gluons travel backwards in time? I found something called a Feynman Diagram. It's a Cartesian plot with spatial position in the y-axis and time in the x-axis. Apparently, when a positron and electron collide, they annihilate and form a single gamma ray, which then splits off into a quark and antiquark. But the antiquark shows a coiled path of a gluon splitting off it with loops that go backward in time. So I'm wondering, do gluons travel backwards in time? How is that possible? [/QUOTE]

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