Electronics: Man-Made Frog's Eye

Crouched motionless on a mossy stone, a frog seems to be thinking about nothing, and in a sense this is true: the frog's brain is too small and primitive for real thought. But its bright, bulging eyes have a keen, built-in intelligence of their own. They select among stimuli and report to the feeble brain only those visual items that are important to a frog's wellbeing. When a cloud drifts slowly over the sun, a frog's eyes do not bother the brain with the meaningless event. But when a bird swoops down, suddenly...

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