Where toilets overflowed, a new system offers hope

Where toilets overflowed, a new system offers hope

For more than three decades, Joyce Wangui has sold sugar, cooking oil, and mobile phone airtime from a tin-roofed kiosk in the winding alleys of Mukuru Kwa Njenga, one of Nairobi’s most densely packed informal settlements. Her kiosk, weather-beaten but orderly, is the...