The reason we don't have a lot of production is no one has put together a system dedicated to making antimatter.
But we do, the Fermilab Antiproton Source. By my calculations, it currently has about an order of magnitude higher production rate than the parent's prediction (which originally comes from an un-sourced section of the wikipedia article on antimatter).
Using the current process it would take 2 billion years to produce 1 gram of anti-hydrogen
We are much better at making anti-protons. Fermilab's Antiproton source can regularly do 25*10^10 antiprotons an hour, with rates topping out at 28*10^10 per hour (sustained).
So you could probably manage one gram in 'only' 250 million years with what we have built today. However, the best antiproton storage machine has only held 540*10^10 antiprotons at the same time, so there'd need to be an improvement in storage.
Shock! horror! Apple are using their own website to push Safari and claim that their own browsers are ahead of the game on standards support? The bastards!!!
Shhh! You're interrupting the two minutes' hate!
A flat spin killed Goose.
Compressor turbine stall killed Goose.
Not to be pedantic, but a rather nasty blow to the head during ejection killed Goose.
To be pedantic, Physics killed Goose.
"Guns don't kill people; Physics kills people!" —Dick Soloman
The fine article says that this results limits the number of possible quarks. Can someone give an explanation (or even the outline of one) at a level that someone with a B.S. in physics can understand?
One of the things single-top is sensitive to is the coupling strength of the top and bottom quarks via the weak force. The value of this coupling is tightly constrained if one assumes that there are only six quarks (ie. there are three generations of matter). The fact that they measured it and it's within the six quark ballpark means that it is very likely that there isn't another pair of quarks waiting to be discovered.
The basic idea is that if the top and bottom coupling strength is measured to be less than the value we expect for six quarks then that means that some of that coupling strength actually goes to a different, seventh or eighth, quark. But I'm grossly simplifying things here for the general slashdot crowd.
"God is a comedian playing to an audience too afraid to laugh." - Voltaire