In Zanzibar, it's become big business - and ... some husbands threatened divorce if their wives went out to farm seaweed," says marine biologist Flower Msuya. "But when they saw the money women ...

Set to start operating this fall, the farm will cover 5 hectares (12.4 acres) and is expected to produce at least 6,000 kilograms (13,227 pounds) of fresh seaweed in its first year.