March 20 is International Happiness Day — a day that the United Nations had dedicated to the celebration of joy. We asked photographers around the world to share a picture that can bring bliss.

If our 13.8 billion-year-old cosmos could be considered middle-aged, researchers note these new images captured around its 380,000th birthday represent a snapshot of the universe as a newborn.

Experts demystify the science of awkwardness — and explain how to reduce the emotional intensity of mortifying flashbacks (like that one time you called your teacher "Mommy").

That's the perspective of a World Health Organization official after the Global Measles and Rubella Laboratory Network, which detects and controls measles, lost its sole funder.

A jury in North Dakota has found Greenpeace owes hundreds of millions of dollars to Energy Transfer, the company that built the Dakota Access oil pipeline.

Experts say the verdict has relevance for free speech issues nationwide.

Last week, officials announced that a volcano 80 miles west of Anchorage is "likely" to erupt within the next few weeks or months. That could send ash into the air for hundreds of miles.

White House communication has caused confusion over the fate of the country's newest national monuments in California.

U.S. Health Secretary Robert F. Kennedy Jr. says the Trump administration will continue to treat opioid overdoses as a "national security" emergency even as fentanyl deaths decline.

The project, called Darwin's Cats, aims to enhance our understanding of feline behavior and genetics.