Bloomberg explores land use in the United States with a series of low-resolution maps that become more and more like infographics in the shape of the lower 48 states. It’s a revealing look at the big picture, with some surprises: 41 percent of U.S. land is used to feed livestock.

In 1916 frost maps that show the average dates of the last spring and first fall killing frost, Slate’s Rebecca Onion sees the history of climate change, given the growth in the length of the growing season since then. (Trying to find a modern-day example for comparison; frost maps don’t appear to be updated as rigorously as, say, hardiness zone maps.) [Slate Vault]