Select independently determines what we cover and recommend. When you buy through our links, we may earn a commission. Learn more. If you’ve stumbled into red light therapy videos on social media, you ...

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 ...

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 ...