New prosthetics and medical techniques are saving soldiers' lives after the battlefield.
One of the most active volcanoes on Earth, Hawaii's Kilauea has erupted continually for more than 30 years.
More than half of the continental United States this summer is experiencing moderate to extreme drought, according to reports released by the National Weather Service.
Sixteen countries rank as the Worst of the Worst in personal freedoms, with 23% of the world population having no say in how they are governed.
The 20th century saw big strides in defeating many illnesses, but heart disease and cancer are still the major causes of death in the United States.
Wreckage from the earthquake and tsunami that devastated Japan in 2011 has traveled thousands of miles across the Pacific Ocean.
TV sets are going dark as viewers turn to their computers and tablets to satisfy their hunger for entertainment.
The 2013 group is second only to the 1978 batch of hopefuls. Only a tiny percentage of applicants are selected to become astronauts.
In an historic demographic shift, white babies are now in the minority compared with nonwhite newborns.