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The most dense and difficult to understand Eyewitness book yet. Really tough and abstract concepts about which I didn't know very much. Stuff I learned and or know better now: the electromagnetic spectrum goes from big wavelengths to little wavelengths and the shorter the wavelength, the stronger it is (and more likely to injure/kill humans - radio waves, television waves, radar waves, microwaves, infrared waves, visible light waves, ultraviolet waves, x-ray waves, gamma ray waves, cosmic ray waves; also, infraRED is next to red and ultraVIOLET is next to violet on the visible spectrum; something appears orange because it absorbs all of the colors EXCEPT for orange; how the concave nature of glasses (for people with nearsightedness or myopia) and contacts bends light to make the image clearer and that it's a VIRTUAL IMAGE we see through contact and lenses that is not actually in that place. crazy.
