The Looseleaf Papers

Drafty windows and the knapsack problem

The windows of my apartment are old and drafty, so I wanted to use one of those plastic window insulation kits to better insulate the windows. So I measured all four of the windows:

Curvature of the earth in cm per km

The curvature of Earth’s gravity field is approximately 8 centimeters per kilometer. This produces horizon effects even within a single large building.

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