Pieces Of The Sky...
Why is the sky blue? What is the firmament made out of? What is the dome above us? The answer may be something known as silica aerogel.
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![Francis Poulenc - Cello Sonata [With score]](https://sun9-31.userapi.com/WId6iJydGw3MJKZAy1emBPqB9IgNjj4y9e8aFQ/X1vQ7ryXIA4.jpg)
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