Pakistan’s floods are producing some mind-boggling numbers: 3.5 million children are at risk of disease, and roughly one-fifth of the country is under water. 20 million people have been displaced from their homes by the ongoing deluge.   

And some more disturbing numbers: the UN has asked for $460 million in emergency aid. To date, donor nations have only pledged 35 percent of that amount. A little less than half the donations - roughly $76 million - has come from the United States.