LAKE CHAD, CHAD - JULY 10: Girls in colorful headscarves sit in a classroom in their tribal village in central Africa on July 10, 2007 around Lake Chad, Chad. (Photo by Jeff Hutchens/Getty Images)
LAKE CHAD, CHAD - JULY 10: Girls in colorful headscarves sit in a classroom in their tribal village in central Africa on July 10, 2007 around Lake Chad, Chad. (Photo by Jeff Hutchens/Getty Images)