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Why is sky blue , Grass green , blood red. Can any one become invisible?
The sky is blue because it is reflecting light from the ocean. Grass is green because of chlorophyll which is green and absorbs sunlight to turn into energy for the grass to live. Blood is red when it contacts oxygen because of the iron in the blood oxidizing. And yes, to an extent, someone can become invisible - around a year ago there was an article in the magazine Popular Science about a scientist - I believe in Japan, or Korea? - who developed a suit that had the technology to sense and reflect light from around an individual to effectively make them invisible to the human eye.
Oh, and in case you didn't know, the reason we see colors is connected with the reflection and absorbtion of different spectra of light.
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