In a clip from the BBC’s Wonders of the Solar System, Brian Cox visits an ‘alien’ within a cave that’s a death trap for ...

Deep inside caves, water dripping from the ceiling creates one of nature’s most iconic formations: stalagmites. These pillars of calcite, ranging from centimeters to many meters in height, rise from ...

These mineral "icicles" hanging from the subway ceiling form like stalactites in caves and may contain clues to the city's ...