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We may earn a commission from links on this page. This year, Global Running Day is on June 4. Like most unofficial holidays, it is a day not only about

Space The Hubble constant, a set number that connects a galaxy’s speed to its distance from Earth and tells us how fast the universe is expanding, was first described more

Beaks have grown longer and larger, and ranges have expanded to follow the feeders…Read More

More than 17,000 acres around the Klamath River in Northern California, including the lower Blue Creek watershed, have returned to the Yurok Tribe, completing the largest landback deal in California

More than 200 wildfires are blazing across central and western Canada, half of which are out of control because they’re so hard for crews to access, forcing 27,000 people to

The red handfish is a surly-looking creature native to seas surrounding Tasmania, with a boxer’s face and a ruddy complexion that’s eerily translucent. Over millennia, it has evolved creative uses

Venus has groupies—a family of asteroids that share its orbit, either trailing it or leading it as the planet revolves around the sun. Researchers have known that such stealthy space

For centuries, people encountering sloths for the first time have reacted by ridiculing them. In 1526, Spanish conquistador Gonzalo Fernández de Oviedo y Valdés wrote that the sloths he’d seen in the

The robots that share our public spaces today are so demure. Social robots and service robots aim to avoid offense, erring toward polite airs, positive emotions, and obedience. In some