Roughly 660,000 people die each year from malaria, many of them young children. A recent clinical trial by GlaxoSmithKline indicates that if their vaccine is rolled out in the countries hit hardest, up to half of these lives could be saved. GSK intends to distribute the vaccine in a low-cost, non-profit manner, aside from a five percent price increase built in for future research, hopefully starting in 2015. The vaccine was developed with partial funding from the Bill and Melinda Gates Foundation, which is chalking up an impressive list of global health victories that also includes improved TB tests and strides toward polio eradication. The couple recently sat down for a joint question and answer session about their work and relationship.