What are cone for?

The eye .In there eye there is rod cells and cone cells. Rod cells detect color and Cone cells detect black and white. The cone cells let you see in the dark.

A cone is a geometric shape. If we "build" it, it may be easier to understand what it is. Start with a plane and put a circle in it. Now pick a point that is "above" the plane, and draw a line from...

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