Flags of the competing political parties whip in the wind of seaside Karachi. But little else is stirring in this city of 18 million this day.
The MQM, a leading political party in the megacity, has shut Karachi down with a general strike in response to a deadly bombing at its election office. But as soon as the strike ends, the streets spring to life as if nothing were amiss.
Some critics say that ending polio has become Bill Gates' "white whale."
Why not just settle for the huge drop in polio cases that we've seen over the past decade and then spend money on other things that kill so many more kids, like diarrhea and malnutrition?
"Polio is special," Gates tells NPR's Robert Siegel on All Things Considered. "Once you get it done, you save $2 billion a year that will be applied to those other activities. There's no better deal economically to getting to zero."