December 13, 2013; 4:25 AM ET
The coldest air of the season so far is settling in around Boston. A new winter storm will move in this weekend and tap into the cold air. more >
Snowfall from tomorrow evening into Sunday morning will total 6-10 inches
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.