Bill Gates calls himself an “impatient optimist.” Would that we all shared his optimism and, especially, his impatience. (..) “I am optimistic because aid works.  I am also impatient.  We know how to save lives, we have low-cost tools, but children are still dying because we can’t reach them all with the interventions that we have.  Solutions won’t solve anything if they can’t be delivered.  Every human life is precious, and every death is tragic, and this gives me a sense of urgency to create and deliver what is needed.”