What is the purpose of light? How does light work? Why does light exist? This video explores the longstanding debate over whether light is composed of particles or waves. Albert Einstein demonstrated ...

What Is Therapeutic Light Therapy? Therapeutic light therapy, also called phototherapy, is a form of treatment for certain types of depression, sleep disorders, and other conditions. It involves ...

A spectrograph splits light ... Scientific American subscriber since I was 12 years old, and it helped shape the way I look at the world. SciAm always educates and delights me, and inspires a sense of ...

It's a lovely summer weekend morning. We relax in our living room with the sunlight coming gently through the windows. We glance outside and can see the green leaves and watch birds in the yard. We ...