visual pigment

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Mother tickling her daughter, sitting in a garden

Why Can’t You Tickle Yourself?

Hand washing. Healthcare worker washing hands in hospital sink under running water. contagious diseases wash hands, handwashing hygiene, virus, human health

17 Questions About Health and Wellness Answered

Discover

A mug shot taken by the regional Colombia control agency in Medellin

Pablo Escobar: 8 Interesting Facts About the King of Cocaine

Florence, Italy Statue of David by Michelangelo

How a Rejected Block of Marble Became the World’s Most Famous Statue

Calendar showing the month of February

Why Are There Only 28 Days in February?

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Hindu Holi Festival celebrations with colored water, powder and colorful flower petals thrown over celebrants at a Hindu temple in Mathura, Uttar Pradesh, India on March 24, 2021.

Holi: Festival of Colors

Statue of Liberty in front of the skyline of Manhattan, New York City, New York.

Who Was the Woman Behind the Statue of Liberty?

visual pigment: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Topics

human eye eye biochrome eyeball tear duct and glands optic nerve eyelid melanin porphyrin saccade carotenoid eye colour Why Do Humans Have Eyebrows?

Key People

George Wald

American biochemist

Quiz

Muscles of facial expression, human anatomy, (Netter replacement project - SSC). Human face, human head.

Characteristics of the Human Body

Male muscle, man flexing arm, bicep curl.

Facts You Should Know: The Human Body Quiz