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photopigment

n.
1.a special pigment found in the rods and cones of the retina

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    Idiom of the Day

    take a toll on (someone or something)
    to damage or hurt someone or something by using it too much or by hard living
    The stress and long hours at work are beginning to take a toll on my friend.



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    Fact
    Gilligan of Gilligan's Island had a first name that was only used once, on the never-aired pilot show. His first name was Willy.      .. More >>
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