Subject: What is the approximate ant population of the world?

My wife and I got into a discussion.  She thinks there might be more 
people on earth than ants. I am 99% sure she is wrong, but it led me to an 
interesting question.  What is the any population?  I think it is probably 
so high that it is ridiculous.  A friend of mine posits that we (humans) 
kill at least 6 billion (human population) ants a day: his theory, since 
30% of the world population lives in rural areas, and it safe to say that 
each person kills at least 3 ants a day, then you have it.  While we might 
not all kill 3 ants a day, there are people eradicating entire colonies, 
and so making up the average.
I don't know if this is a question you guys could/would answer, but I 
spent so long searching the net for an answer I thought, why not ask?

Re: What is the approximate ant population of the world?