Scientists are studying how exactly the giant, cylindrical Guatemala sinkhole was formed, and how to prevent more. Meanwhile, the US is joining relief efforts to help the thousands left homeless by Tropical Storm Agatha.
The record shows that some radicals can be persuaded to give up the gun when inducements and local conditions are right. The Pentagon recently spent $4.5 million to find out more.
What happens when ordinary people decide to pay it forward? Extraordinary change. See how individuals are making a difference...
Mae Azango has gone undercover to report on female circumcision, a rite of the Sande society in Liberia that is performed on young girls.
Mae Azango exposed a secret ritual in Liberia, putting her life in danger
When journalist Mae Azango wrote about a secret women's circumcision ritual in Liberia, she received death threats.
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