A group of former lawmakers and government officials gathered this week in the capital to discuss what they said was secrecy surrounding aliens and unidentified flying objects.    

The new guidelines were issued after the American Urology Association agreed to shift its stance on the screenings, which have often led to unnecessary cancer treatments.    

Bill Sothern has built a career on investigating and remediating environmental hazards, including mold colonies, secondhand smoke, chemical vapors, lead and asbestos.    

Can climate forecasts and campaigners convince the world’s nations that some carbon is unburnable?    

Tiger scat offers DNA traces that can help conserve Nepal’s struggling tiger population.    

Students are able to join the Hawaiian expedition and help in recording humpback whales’ habits.    

Scientists said there was no proof that a salmon-killing disease had made its way to the Pacific Northwest, but a researcher in Canada disagreed.    

Admirers have bought the crumbling laboratory on Long Island where Nikola Tesla worked and are planning to raise $10 million to restore it to house a museum and memorial.    

Pesticides, parasites, poor nutrition and a lack of genetic diversity are blamed for a phenomenon known as colony collapse disorder.    

A famous curve of carbon dioxide levels is close to passing a milestone.    

The rapid expansion of hydraulic fracturing could put pressure on already-stressed water resources from the suburbs of Fort Worth to western Colorado, according to a new report from a nonprofit group.    

The Solar Impulse, a plane with the wingspan of a 747, is the creation of a Swiss team working on fuel-free flight.    

Archaeologists excavating the Jamestown colony site have found in the remains of a 14-year-old girl the first physical evidence of cannibalism by colonists during the harsh winter of 1609.    

A brisk chat between Googlers and a media maven about the emerging Knowosphere.    

Scientists have found the best evidence yet that cancer will increasingly be seen as a disease defined by its genetic fingerprint rather than by the organ where it originated.    

A new view of the sky above, created by an artist for whom photographs are just the starting point.    

Doctors have built and implanted a windpipe, developed with plastic fibers and human cells, in a 2½-year-old girl — the youngest person ever to receive a bioengineered organ.    

A new survey shows how extreme weather influences public attitudes on global warming.    

To be an “eyeshine” expert you might need to spend a lot of time in a dark forest, feeling your way around with a flashlight.    

Over 10 billion gallons were sent into waterways, with 94 percent flowing into rivers, canals and bays in New York and New Jersey, Climate Central said in a report.