Americans celebrated Constitution Day on Wednesday, marking the ratification of the founding document for the nation’s government. To mark the occasion and ahead of the U.S. semiquincentennial, the ...

Physicists at the University of Colorado Boulder have created the first time crystal that humans can actually see, using liquid crystals that swirl into never-ending patterns when illuminated by light ...

For the first time in 25 years, child mortality rates for preventable diseases are projected to increase, after having declined for 25 years. The new estimate comes from models created by the ...