Xylazine, an animal tranquilizer found mixed with opioids, classified as a controlled substance in Pennsylvania

The Most And Least 'Liveable' Cities in The World in 2016 Have Just Been Ranked

NASA's Perseverance Just Had a Unique Problem While Digging Up Its First Mars RockTwo Weird Red Rocks Live in The Asteroid Belt, And They Don't Belong There

Astronomers Detected a Huge New Structure in The Milky Way, And Don't Know What It IsHuge X-Ray Rings Around a Black Hole Reveal The Hidden Dust Between StarsAstronomers Find Dancing Cosmic 'Ghosts' Spawned by The Wild Weather of Black Holes

Nearby Planetary System Could Hold a Habitable Super-Earth, Astronomers SayA Dazzling Meteor Cluster Was Just Captured Live on Camera in Hawaii

The Moon's 'Roughness' Could Be Hiding Water in Shadows, NASA Says

There Could Be a New Explanation of Underground 'Lakes' on Mars, But It's Not WaterSwearing Is Actually a Sign of More Intelligence – Not Less – Say Scientists

Dark Humour Could Be a Sign of Superior IntelligenceThe Top 21 Countries For Quality of Life Have Been Ranked

Children Say They Get More Satisfaction From Pets Than Siblings, New Study FindsGirls as Young as 6 Are More Likely to Believe Brilliance Is a Male Trait