The SciencesMay 1, 2007
Can Molecules Hang Glide on Gravity?
Proposed effect, to slow the fall of a rapidly vibrating molecule, faces skepticism
Relativity
The SciencesMarch 17, 2003
How does relativity theory resolve the Twin Paradox?
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The SciencesJune 24, 2002
Peering Over Einstein's Shoulders
Seeking still more complete descriptions of the workings of spacetime, scientists are testing the boundaries of the special theory of relativity
The SciencesDecember 13, 1999
Recent articles in Scientific American have talked about traveling faster than light. But I always thought that Einstein's theory of relativity forbade that. What gives?