Mysterious gullies on the surface of Mars, long puzzling scientists, appear to have been carved by burrowing blocks of CO₂ ice, according to a recent study that describes this mechanism as an ...

McEWEN, Tenn. (AP) — A massive blast at a Tennessee explosives plant that killed 16 people, leveled the building and was felt more than 20 miles away began in an area where workers used kettles to ...