3 results for “light”
The Human Body
The Senses
light-sensitive cells. There are two kinds. About 120 million rods work in dim light and see only
Article · 4 min read
The Human Body
Sleep and Dreams
Light is the clock's main signal. Bright morning light tells it the day has begun
Article · 3 min read
The Human Body
Skin, Hair and Nails
light from the Sun and protects the cells beneath from damage. Everyone has about the same
Article · 3 min read
