Notes from Limmud 2012: How did the Rebbe's Army Become So Large?

( How did this once small Hassidic community become a $billion outreach empire with more than 5,000 emissaries worldwide? What motivates these young couples to pick up and move to Russia, Zaire or Salt Lake City, where they spend their lives doing outreach to Jews whose lifestyles will never match their own? Why do other Jews support them? )