The details of how the Universe works -- sort of. The problems seem to be first, in theorizing, then locating, and then understanding "dark matter" which appears to be most of the physical stuff in the U. Fascinating, descriptive, easy-to-read, by a knowledgeable cosmologist. Despite the PBS "Book Type" label, this edition is hardcover. [What does "board book" mean, anyway, if not hardcover?] As Greg Bear wrote, "Dark matter is stuff waiting to happen."

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