New research from the Overseas Development Institute into early marriage in Africa and Asia reveals some shocking treatment of teenage girls.
Professor Grace Bantebya-Kyomuhendo, who was lead researcher in Uganda, has made a video explaining what she found.
Nigeria's abducted schoolgirls make headlines but ODI director Kevin Watkins says the bigger scandal is that so few girls in the region are educated.
An ODI report shows that nearly 100 percent of Mongolian children receive secondary education. The US media site Upworthy has profiled the research.