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As comets cross the invisible boundary known as the ice line, their ice starts turning into gas.

A tiger destined for greatness may lead the way to a better future for those of his kind.

Preview of the NewsHour's 9/11 Special

Roy Wood Jr. discusses his new comedy special "Imperfect Messenger."

Polar bears have their own special way of drying off after a swim.

The show's self-professed feminist creators wanted to take on a type generally scorned in popular culture. It's a favorite among critics, but one reviewer worries it will suffer from the Cougar Town effect — good show, terrible name.

River from Rockies to near Sea of Cortez

Kang Gye-Yeol and Jo Byeong-Man are married and have lived together for 76 years.

Each horse breed comes with a special set of attributes and skills.