Since March 14, ozone over Earth's Arctic has decreased to what's normally considered ‘ozone hole levels.' Scientists expect this year's Arctic hole - the largest ever seen over the Arctic - to close again around mid-April 2020.

With water dropping 150 meters (490 feet) through a thick patch of cloud forest, San Rafael Waterfall was one of Ecuador's most captivating landscapes and attracted tens of thousands of visitors per year. But on February 2, the water stopped flowing.

The new fossil discoveries provide clues about flying, spike-toothed reptiles that lived in the Sahara 100 million years ago.

Geologists say the worm-like creature - about the size of a grain of rice - is the 1st ancestor on the family tree that contains most animals today, including humans.

The origin of digits in land vertebrates is hotly debated, but a new study suggests that human hands likely evolved from the fins of Elpistostege, a fish that lived more than 380 million years ago.

The oldest known bird fossil, from the age of dinosaurs, has skull features similar to modern chickens. The scientists who found it have nicknamed it "Wonderchicken." It's providing valuable insights into the evolution of birds.

Some astronomy thoughts to distract you from quarantine life under the coronavirus plague, from Guy Ottewell.

You'll love this video of a couple of penguins openly exploring Chicago's Shedd Aquarium, closed due to COVID-19.

Pine Island Glacier is one of the fastest-retreating glaciers in Antarctica. Watch the glacier’s ice front retreat and shed some notable icebergs over the past 2 decades.

It's OK to feed wild birds. Here are some tips for doing it the right way from a wildlife ecologist.