The philosopher Friedrich Nietzsche questioned the ability of science to explain and give meaning to our world, daring us to think critically not only about religion, but science, and knowledge itself. Learn all about his ideas in this fun video inspired by vintage video games.

Lara Boyd talks further about behavior bringing about changes to the brain, and about why it's so hard to recover after a stroke.

NASA has announced the results of an epic physics experiment which confirms the reality of a space-time vortex around our planet.