Deep inside Earth, researchers see signs that the solid inner core may be arranged in multiple chemical layers far below.

Try these 6 joint-friendly standing moves to fire up your core, raise your heart rate, and help trim belly fat after 50.

Build stronger core in 8 minutes with a bodyweight routine that beats long gym workouts and supports posture and balance ...

Build a stronger, leaner core after 50 with 6 standing workouts that tighten your waist, improve posture, and boost strength.

This is the second in a two-part series. Part one can be found here. The debate over what early math should look like and what should be included in the Common Core State Standards for math is one of ...