Photo of a (currently) dry, dusty cave south of the Atlas mountains. In the past, water was flowing down this large stalagmite formation. We date tiny pieces of stalagmite (~0.25g) to establish when ...

As the Commanding Officer of U.S. Coast Guard Cutter Mackinaw, Jeannette Greene is breaking through barriers and clearing the way for those who come after her. The North Stars: In the March issue ...