Okay, enough of trying to start an orgy, serious question from me.
Why don't up quarks and down quarks annihilate each other? Would that require anti-up and anti-down quarks? Do they even exist?
(Thor McLegend FUCK SHITPANTS PAC MAN, Mon 3 Jun 2013, 14:02, 4 replies)

Yes, that's right.
The "up" and "down" quarks have different quantum numbers and won't annihilate. For example, an up quark has a charge of +2/3, and the down quark has a charge of -1/3. If they annihilated, this would violate the law of conservation of electric charge.

An up anti-quark, however, is a different particle from a down quark, and has opposite quantum numbers to an up quark. It will cancel out exactly with an up quark.

So a proton, wwhich is made up of two up quarks and one down quark, is stable. A neutral pion, with a up quark and an anti-up, is unstable and annihilates into two or three photons in the blink of an eye.
( Amish Information Systems hates misplaced, commas, Mon 3 Jun 2013, 15:53, closed)

Ah, thank you Amish Information Systems.
Your sig states that you consist of more down quarks than up quarks, does this mean you are a neutron?
(Thor McLegend FUCK SHITPANTS PAC MAN, Tue 4 Jun 2013, 13:50, closed)

No,
...but since most atoms have more neutrons than protons, I worked out that, overall, the "down" quarks win.
( Amish Information Systems hates misplaced, commas, Tue 4 Jun 2013, 21:58, closed)

Where do the undecided quarks fit in?
The sideways ones. The ones with more Charm than Beauty.
(Perv With A Dog had his eyes pecked out by scrub jays on, Tue 4 Jun 2013, 22:26, closed)