Supersensitive Cells
Certain cells in the retina of the human eye are so sensitive that they can detect visible light as feeble as 1/100,000,000,000,000 of a watt.
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Supersensitive Cells
Certain cells in the retina of the human eye are so sensitive that they can detect visible light as feeble as 1/100,000,000,000,000 of a watt.