With world leaders about to gather in New York for a UN Climate Action Summit next week, millions of young people from Australia to Iceland took off from school or work on Friday to demand urgent measures to stop environmental catastrophe.
There are only eight psychiatric hospitals to serve more than 190 million citizens in Nigeria. To close the gap, nonprofits throughout the country are finding new ways to reach out to people in desperate need of care, from online Twitter therapy sessions to community outreach via motorized trikes.
The world is at the brink of eradicating polio. A surprise polio outbreak in Israel in 2013 led researchers to look closely for the poliovirus in sewage to detect virus shed in the feces of non-paralyzed people infected with polio, what epidemiologists call the "silent circulation" of polio.
We hear from three foreign journalists based in Washington about what their audience makes of Barack Obama's speech this week on race in America: joining us are Ewen MacAskill with Britain's Guardian newspaper