China's Lunar New Year exodus cools major cities, study shows

During the week-long Chinese New Year, also known as the Lunar New Year, work is suspended, businesses close and nearly 300 million people leave cities to join their families in rural areas for traditional gatherings. The ...

Ozone layer: how the hole was plugged

In rare good news for the environment, a UN report confirmed Monday that the hole in the ozone layer that had been threatening Earth since the 1980s is shrinking.