There are six different quarks, but physicists group them into three pairs:
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Up (u) and Down (d)
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Charm (c) and Strange (s)
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Top (t) and Bottom (b)
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Quarks have the unusual characteristic of
having fractional electric charge of
either +2/3 or -1/3, unlike the -1
charge of an electron and the +1 charge of the
proton.
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