A Farm Is Blooming In An African Slum Where Water Is Scarce

KIBERA, Kenya—For years Mohamed Abdullahi and his young friends made a living beating up and robbing their neighbors here on the outskirts of Nairobi in one of Africa’s most desperate slums.
Sometimes, though, the victims fought back. Ten of Mr. Abdullahi’s fellow criminals were “brutally killed,” he told me. Some were stoned. “Mob justice,” Mr. Abdullahi [...]