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What is the charge of an up quark<br>and of down quark?

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Is vacuum matter? What are ten<br>things that are not matter?

Are quarks confineable for study?

Quarks we study at Jefferson Lab are confined to each other by nature's laws. We shine our electrons on them to observe their behavior in their confined state. This is not so different from turning on a light to see a gold fish swimming in a glass bowl.


Nathan Isgur, Theory Group Leader (Other answers by Nathan Isgur)

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