Indictments of a longtime extremism researcher and her former organization raise a crucial question for researchers in the field: What are the ethical limits on research about often-dangerous groups?
After 9/11, suspicion of Islam hardened into an assumption in Texas that Muslim identity itself signals danger, writes a scholar of constitutional law.
A geologist explains how thawing permafrost and melting ice are increasing the risk of destructive floods in the Himalayas and other high mountain regions around the world.