The Centers for Disease Control and Prevention said flu activity was declining in all regions of the country.

The new recommendations, released Monday by an influential group, reverse longstanding guidelines.

The Large Hadron Collider experiment, designed to shed light on the cosmos, restarts after 14 months of repairs.

A European satellite launched to study the Earth's water cycle returns its first data, confirming its novel instrument is working well.

Fish reared in water acidified by CO2 may become "fatally attracted" to the smell of their predators, say scientists.

Private messages hacked from a British university are causing a stir among global warming skeptics.

The successful operation of the Large Hadron Collider marked the resumption of the world’s biggest and most expensive physics experiment.

Two fingers and a tooth removed from Galileo Galilei’s corpse in the 18th century and given up for lost have been found again and will soon be put on display, a Florence museum said Friday.

Arguments over hacked climate change e-mails

Evidence of Asian carp, a fish that some fear could destroy the ecosystem of Lake Michigan, has been found beyond a barrier intended to keep the fish out.

The effort had been seen by opponents as a possible new front in the national debate over the matter.

Dr. Crewe, a University of Chicago physicist, developed the high-resolution electron microscope that captured the first image of an individual atom.

The effort had been seen by opponents as a possible new front in the national debate over the matter.

Dr. Crewe, a University of Chicago physicist, developed the high-resolution electron microscope that captured the first image of an individual atom.

Evidence of Asian carp, a fish that some fear could destroy the ecosystem of Lake Michigan, has been found beyond a barrier intended to keep the fish out.

Smashing! Cern's particle cruncher finally restarts

The successful operation of the the Large Hadron Collider marked the resumption of a $9 billion quest to investigate the universe when it was less than a trillionth of a second old.

How engineers repaired the Large Hadron Collider

Amid concerns over an aging stockpile, federal advisers have concluded that programs to extend the life of the nation’s nuclear arms ensure their destructiveness for decades to come.

Engineers have sent proton particles all the way round the Large Hadron Collider (LHC) machine for the first time in more than a year.