Morning Briefing

Though the number of new polio cases has dropped by 99 percent over the past 20 years, World Polio Day is recognized "because we haven't done enough yet," Bill Gates, co-chair of the Bill & Melinda Gates Foundation, writes in his blog, "The Gates Notes." He continues, "The last one percent is the hardest percent, and we have to do even more than we've already done if we hope to finish the job on polio. The day the world is declared polio free is the day we can really begin celebrating" (10/21).