Physics

A drop of water enlarged to the size of the Earth would reveal molecules about as big as baseballs or footballs. Stranger still, the authors say, even the molecules in a solid do not permanently touch their neighbors.

In this early-twentieth-century introduction, Willis E. Tower, Thomas D. Cope, Charles H. Smith, and Charles M. Turton begin not with dazzling machinery but with familiar things: dew, echoes, pumps, ice, and the pull of the earth. Their challenge is to turn everyday impressions into scientific knowledge—by observing, measuring, and tracing effects to their causes. From the states of matter to the difference between physical and chemical change, each ordinary fact opens onto a hidden order. What changes when you learn to look at the commonplace as a physicist would?

With centuries of literature, it's inevitable that some will fall through the cracks. We hunt down public domain works and restore them so they're not lost to the world.

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