片長：大約60分鐘
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What is light?
We are so accustomed to take light for granted that we almost never stop to think about what it really is. Obviously, our world would be a very different one indeed if light did not exist-or, to putit another way - if we were not capable of perceiving it.
The sense of sight
Most of the information we perceive comes from our sight. The human eye can distinguish up to 7 million colors and tones. Insects, on the other hand, have compound eyes, madeup of facets, which send.....
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