December 21, 2013; 5:03 AM ET
A storm threatening to hinder early Christmas travel from central and coastal Texas to central New England will bring heavy rain to the area for the start of the weekend. more >
Rain, some heavy, and thunderstorms to affect the area this morning
The sheer number of people, their interactions with animals and ecosystems, and the increase in international trade and travel are all factors that will likely change the way humanity deals with preventing and treating epidemics, experts say.