"A recent study by Mark R. Rank <http://gwbweb.wustl.edu/FACULTY/FULLTIME/Pages/MarkRank.aspx>, a professor at Washington University <http://topics.nytimes.com/top/reference/timestopics/organizations/w/washington_university/index.html?inline=nyt-org> in St. Louis, startled some policy makers in finding that half of Americans receive food stamps, at least briefly, by the time they turn 20. Among black children, the figure was 90 percent."
http://community.nytimes.com/comments/www.nytimes.com/2009/11/29/us/29foodstamps.html
Joanna