In the experiment, a high-power green laser passed through a ruby cube, illuminated from the side by a blue laser. The green laser increased the ruby’s absorption of the blue light, creating a darker ...

Let's Learn is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku, Samsung Smart TV, and ...

How plants optimize photosynthesis under changing light conditions. For research, plants are frequently grown under stable lighting, which does not reflect natural conditions. In a series of ...

A team of scientists at the National University of Singapore have developed a new kind of solar cell that uses the contrast of both light and shade to generate electricity. It works by placing a super ...

Bruce Handy, Lisk Feng and Cat Min present shadows for what they are: the non-nefarious interplay of light and dark. By Leigh Ann Henion Leigh Ann Henion is the author of “Phenomenal: A Hesitant ...

Researchers have found that under certain conditions, a laser beam can act like an opaque object and cast a shadow, opening new possibilities for technologies that could use a laser beam to control ...