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Cosmology: The History and Nature of Our UniverseThe most familiar constituents of the universe are atomic matter and light; neutrinos make up another component; 96 percent of the universe is dark energy and dark matter; the relative amounts of these constituents changes as the universe expands.

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Now PlayingCosmology: The History and Nature of Our UniverseThe most familiar constituents of the universe are atomic matter and light; neutrinos make up another component; 96 percent of the universe is dark energy and dark matter; the relative amounts of these constituents changes as the universe expands.0Discovering Your Roots: An Introduction to GenealogyInterviewing relatives as one of the foundations of genealogy; strategies and 10 vital tips to help one get the most out of sitting down with family members; transforming pleasant conversations into solid foundations for future detective work.