Since the 1930s, Louisiana has steadily been losing land that protects the city from hurricanes and other disasters. So the government group charged with shielding New Orleans from flooding sued about 100 oil and gas companies on Wednesday for their role in damaging coastal wetlands.
Biologists have discovered they can track hard-to-see species in streams, ponds and even the ocean by sampling the water for DNA. Scientists say the technique is an important conservation tool: So far, it's been used to track declining giant salamanders and even locate a rare whale.
On July 19, a spacecraft nearly 900 million miles from Earth took a color picture of our planet. NASA's Cassini spacecraft snapped the picture from orbit around Saturn. Now scientists have finished processing the picture. It shows a small blue dot next to the giant ringer planet.
A growing body of research shows that for most people with a normal diet, taking vitamins may do nothing at all -- and overdoing it can even be harmful. We explore the risks and benefits of taking your vitamins.
Last year, virologists traced the mysterious illness of two Missouri farmers to a virus never seen before. Now, scientists have found the so-called Heartland virus in ticks. The discovery means the U.S. has another tick-borne illness on its hands — and "another reason to avoid getting bit."
Physicians are partly to blame for the increasing popularity of untested treatments, says Dr. Paul Offit. Rather than pushing back against misguided patient demand, he says, doctors have "acted like waiters at a restaurant, simply asking, 'What would you like?' "
Dolphins, like humans, are part of complex social networks. And research now indicates that they use their unique whistle sounds to identify and communicate with each other. "Every time a dolphin heard its signature whistle, it called back, sometimes multiple times," one researcher says.
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