Updated: 1 hour 8 min ago
A computer simulation of America's worst day of tornadoes in decades finds a link to land-clearing fires in Central America.
Skip the jewelry store, and head instead for the starry sights on display in this week's gems for stargazers.
Immigration and changes to the traditional family are reshaping Italian society, author says.
The Deep Space Climate Observatory mission depends on the physics of an increasingly crowded location.
After a decade of anticipation, the Deep Space Climate Observatory launches, watching for solar storms and observing Earth's clouds.
Surprisingly quirky photos from our archives.
Even small changes in sea levels—which affect the weight sitting on top of volcanoes—are enough to influence underwater eruptions, says a new study.
Hint: To look fierce. This week, we're delving into the choppers of the animal world.
Zimbabwe embraces lucrative export of baby elephants as more humane than lethal culling.
The colorful invertebrates are moving north along the California coast as ocean waters warm due to global climate change, scientists say.
A nebula’s veil parts, a Mars rover is revealed, and moons make tracks across Jupiter in the week’s best space pictures.
The controversy over measles vaccination has its roots in a generational divide as well as misinformation and distrust of government and science.
Jupiter ascends into perfect sky-watching sight, just as NASA proposes a trip to its most intriguing moon.
"People find it instructive and helpful, but also kind of fun—in a macabre kind of way," says the American Alpine Club's executive editor.
As the President opened the Atlantic to oil drilling, he closed a bit of the Arctic. How much difference does it make?
Photographer Pete Muller finds tragedy but reason to hope during two trips to cover the Ebola outbreak in the West African nation of Sierra Leone.
A photographer caught the 130-pound monster on camera in November off the southern California coast.
New research may pave the way for certifying coffee as bird-friendly in the country where coffee began: Ethiopia.
A captive orca in Florida has been ruled to be a member of an endangered species, but it will remain in an aquarium for the foreseeable future.
Amid the polarized debate over vaccinations, understanding how outbreaks start and spread, why the measles has come back in the U.S. after it was all but stamped out, and what the anti-vaccination camp is thinking.