Behind the "accidental" drone attack in Nigeria

At least 85 civilians have been killed in Kaduna state, north-west Nigeria, in a drone attack. The incident took place during a religious celebration on Sunday, according to the local emergency management authority. President Bola Tinubu says it was a "bombing mishap". So what went wrong? And has something like this ever happened before? Also, why are children in South Sudan turning to drug and alcohol abuse?And we meet Jennifer Uchendu, one of the inspiring women on this year's 100 Women list.