Stunning 3-Star Experiment Validates Core Tenet of Einstein's General Relativity

An Immunologist Explains Why Delta Makes COVID-19 Vaccination Even More ImportantCRISPR Breakthrough Blocks SARS-CoV-2 Virus Replication in Early Lab Tests

Raw Dog Food Could Be Fueling The Spread of Antibiotic-Resistant SuperbugsThe 'Lambda' Variant Is Now Found in 29 Countries. Here's What We Know About ItMolecules Produced by Gut Bacteria Could Help The Human Body Fight Cancer

First Known Case of a Patient With Two Different COVID-19 Variants Was Just ReportedEndometriosis Takes a Toll on The Careers of Women, Finnish Study Reveals

There's a New Review of Potential SARS-CoV-2 Origins. Here's What Experts Think

One Vaccine Dose No Match Against Delta Variant, New Study SuggestsAstronomers Have Made an Unprecedented Detection of Clouds on a Far-Off Exoplanet

Three Record-Breaking Quakes Have Been Detected on Mars, And They're FascinatingThose Cracks Found on The ISS Are Likely 'Serious', Says Former NASA Astronaut

Astronomers Have Discovered a Giant, Empty Cavity Lurking in SpaceNASA Announces a Dark, Eerie Moon Landing Site For Its Next Rover Mission