A rundown on what’s at stake for global health if the U.S. withdraws from the World Health Organization and an update on bird flu are in this week’s science news roundup.

How do opinions form and change in large groups of people? That's not just a sociological question, it's a mathematical one. Ph.D. candidate Federico Capannoli studied opinion dynamics. He defended ...

Vikki Velasquez is a researcher and writer who has managed, coordinated, and directed various community and nonprofit organizations. She has conducted in-depth research on social and economic issues ...