What's up in
Solid or Liquid? Physicists Redefine States of Matter
Glass and other strange materials have long confounded textbook definitions of what it means to be solid. Now, two groups of physicists propose a new solution to the riddle.
As Supersymmetry Fails Tests, Physicists Seek New Ideas
As the elegant theory of supersymmetry continues to fail experimental tests, physicists debate whether to change course and what the future holds for particle physics.