Birds do it, bees do it, even educated fleas do it. People do it too--have babies, that is--but sometimes they need a little help getting there. Often the problem is simple and can be handled without medical intervention. Unfortunately, in many cases it's more complicated and can lead to a long, costly, and emotionally trying treatment process. Each year, more than 6 million people become fertility patients in the United States, alone. And they're...