4.29 avg rating — 1,077,005 ratings

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4.13 avg rating — 1,840 ratings

"Because I'm a devotee of Connie Shak Lin."

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"Understanding the universe matters."

4.40 avg rating — 78,969 ratings

"Questioning the nature of reality."

4.21 avg rating — 216,834 ratings

"Because life is like this."

4.27 avg rating — 19,466 ratings

"Because the physical is at least as important as the spiritual, and no less elusive."

4.30 avg rating — 7,815 ratings

"I need to know the nature of the universe."

4.39 avg rating — 385,358 ratings