What Wiped Out the Dinosaurs?
New studies suggest that dramatic climate changes were killing off behemoths even before the asteroid impact
by Edwin Dobb, Photography by Andrew Geiger
Can Turtles Live Forever?
A quiet backwoods study opens a huge window on aging.
Titan's Time Warp
Is Saturn's huge moon just like Earth 4 billion years ago? Scientists navigating the Cassini spacecraft for a rendezvous with smoggy Titan are betting on it
Does the Universe Exist if We're Not Looking?
Eminent physicist John Wheeler says he has only enough time left to work on one idea: that human consciousness shapes not only the present but the past as well