|When it's time for dinner in developing countries, the question often is not about what to eat, but whether there is anything to eat at all. The World Food Program says one out of every six people in the developing world goes hungry every day.|
Rosa and David Martinez might have been among them. They were subsistence farmers in Oaxaca, Mexico. They're old and poor and can no longer work their land, so they could have been in real trouble were it not for a new "crop" they came across recently.
Conrad Fox reports.