What is it about human beings that makes us always want to push the limits? When it comes to the frontiers of medical science, is it possible to go too far?
What does it take to achieve a long and prosperous life? In The Blue Zones, National Geographic writer and explorer Dan Buettner relates his attempt to find out.
Why the long fascination with superheroes? Does it indicate a deep-seated hope people have that someone will save them from the current peril or crisis?