Many people know that stars appear to twinkle because our atmosphere bends starlight as it travels to Earth. But stars also have an innate “twinkle” — caused by rippling waves of gas on their surfaces ...

Coughing in dogs may be easy to miss. Here's how to tell if your dog has a cough and tips to keep them safe as a mystery respiratory illness spreads in the U.S. It's the first symptom in most dogs who ...