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In the dark

What is the universe made of?

Pre-Bang branes and bubbles

What happened before the big bang?

Cosmic questions, answers pending

Special section

Book Review: The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos by Brian Greene

Review by Tom Siegfried.

Book Review: The Social Animal: The Hidden Sources of Love, Character, and Achievement by David Brooks

Review by Bruce Bower.

Cosmic Challenge: The Ultimate Observing List for Amateurs by Philip S. Harrington

This guide to observing the heavens beckons backyard astronomers to find 187 targets using instruments ranging from bi­noculars to monster scopes.