The CDC's second-in-command, Dr. Ralph Abraham, abruptly stepped down Monday. It's the latest in a string of resignations at the top of the agency.

Add Yahoo as a preferred source to see more of our stories on Google. Big Four Ice Caves will be closed to the public today starting at 8 a.m. so emergency responders can practice drills in the event ...

Add Yahoo as a preferred source to see more of our stories on Google. For the first time in more than a decade, the Apostle Islands ice caves opened for exploration Monday. The stunning Lake Superior ...

Big Four Ice Caves will be closed to the public today starting at 8 a.m. so emergency responders can practice drills in the event of a cave collapse or major avalanche. Parking at the Big Four Ice ...