Waves of light and sound interact to drive electronic and structural changes in a perovskite crystal. At the atomic scale, ...

Earth is divided into two halves: the Northern and Southern Hemispheres. Both reflect equal amounts of sunlight (albedo) even ...

A circle running along the 27° east and 153° west meridians divides the globe into two halves with equal reflectivity – and ...

In the very first microseconds of the Big Bang, something strange happened. Matter somehow outnumbered antimatter and kept the fledgling universe from annihilating itself. This break with conventional ...

This jingle has helped generations of algebra students recall the quadratic formula that solves every equation of the form $latex ax^2+bx+c=0$. The formula is as ...

Receive emails about upcoming NOVA programs and related content, as well as featured reporting about current events through a science lens. Symmetry also has an aesthetic meaning, although this is ...

We are fond of saying things are symmetric, but what does that really mean? Intuitively we have a sense of symmetry as a kind of mirroring. Suppose we draw a vertical line through the middle of a ...

Facial symmetry is sexy, but perhaps not for the reasons scientists had long thought. Humans have such a strong preference for faces and bodies that are symmetrical that evolutionary psychologists and ...