Among the myriad of problems for those living in the developing world is a lack of vitamin A in their diets.  According to the World Health Organization, vitamin A deficiency is responsible for perhaps up to 500,000 children going blind each year.  Fortunately, and thanks to the wonders of agricultural biotechnology, help may soon be on the way.  According to the BBC, British researchers have developed a new genetically modified strain of golden rice that produces a whopping 20 times more beta- carotene than previous varieties.  Beta-carotene is important, of course, because it is converted by the human body to produce vitamin A.  The seeds of this plant are being made available for free, and its widespread use is expected within the next five years.