Hanging from the door of a mini-bus taxi as it jerks and jinks through traffic, 16-year-old Gires Manoka calls out the van's destination to potential passengers as it crosses Kinshasa, the capital of the Democratic Republic of Congo.
Seated under a tree, biologist Zozo Bazomba welcomes a steady stream of visitors to the Action Nature et Médecine centre in Bumbu commune in the DRC. Suffering from a range of ailments, they have come from across Kinshasa, the capital, in search of sachets of powdered moringa leaves.