Although the holdings of what was once the most significant printer and publisher in 16th-century Europe were exceptional, it was the museum's deeply atmospheric rooms, side-lit through stacked leaded glass windows shielded by dark shutters, that I had come to see.

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Through the lit window as he came around the side of the house he could see his family in the kitchen eating pizza, and it did occur to him then that it was late for them to be having supper.

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If that were the case, one side of Gliese 581d would be permanently lit (and heated) while the other experienced unending darkness.

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