By the BBC's Greg Morsbach from Cuba
Cuba - one of the world's last socialist regimes - has surprised many economists by surviving a US trade embargo lasting more than 40 years.
The small Caribbean island nation has continued to defy expectations that it's about to collapse under the strain of a run-down state economy.
One reason is the radical changes to Cuba's agriculture. A recent report by the American agency for sustainable farming, Food First, said annual production of fruit and vegetables is growing at 250% a year.
And the produce is grown without any help from chemical fertilizers, pesticides or herbicides.