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By Melissa Gaskill of Nature magazine The 1,000 kilometers of impenetrable barrier constructed along the Mexico-United States border, with the aim of stemming illegal human immigration, is also hampering the movements of animals, including several endangered species, a recent study finds. The species most at risk are those with smaller populations and specialized habitats, says Jesse Lasky, a graduate student at the University of Texas, Austin, and an author on the study, published in Diversity and Distributions

Trash Talk: Watching the movements of Tiger Woods these days is a little like tuning in to “Masterpiece Theater” and instead getting the Kardashians.

For most of human history, we have defined time through the movements of planets and stars.