They say not to judge a book by its cover, but when browsing at a bookstore, of course the books I pick up first are the ones with the bright covers. Only after I have fondled all the colorful books or ones with nice textured covers will I look at titles, names, etc. So this assortment of books contains the best of the brights. Not only do they represent key points along the visual electromagnetic spectrum, but they cover a broad range of subject matter as well.