When humans have conflicts with wildlife, the first reaction is often to cull them. But there's little evidence that it works.

By Robert Lennox, Austin Gallagher, Euan Ritchie, Steven J. Cooke, The Conversation

Advertisers and employers are moving to take advantage of social networking Web sites, such as MySpace and Facebook, as the sites draw hefty numbers of users. Judy Woodruff reports on the phenomenon in the first part of a series on…