Bioengineers are creating human body parts to replace organs and manage life-threatening diseases. How techniques like 3-D printing and stem cell research are driving medical advances and raising ethical questions
A leading economist explains why most terrorists come from middle-class, often college-educated backgrounds and are not poor and illiterate. A look at the economic roots of terrorism.
- Alan Krueger professor of economics and public policy at Princeton University, an adviser to the National Counterterrorism Center, and coauthor of "Inequality in America" and "Myth and Measurement."
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