Amazon supposedly asks job applicants to solve this "hanging cable" problem. Here's what it looks like—and how to solve it.

Reviews of notable new fiction, nonfiction, and poetry.

A discrete time model is presented for dynamic traffice assignment with a single destination. Congestion is treated explicitly in the flow equations. The model is a nonlinear and nonconvex ...

A new level of partisan one-upmanship should spur urgent demands for reform.

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Colorado has a wild horse problem. Could its expanded birth control darting program be a model for the West? Strategy to meet BLM population caps has relied on volunteers.