Scientists have discovered that under the right conditions, a gummy bear-like ball can roll down a vertical wall all by itself—upending a core assumption in physics.

Researchers studying decades of earthquake data say they have found the first evidence that, in addition to spinning backward, Earth’s inner core in changing shape.

Earth’s inner core isn’t just slowing; it’s also shape-shifting, study finds. ... The planet’s inner core was previously thought of as a hard, solid sphere.