Science

Follow PBS NewsHour’s complete coverage of Science and Technology stories.

On Monday's NewsHour, Miles O'Brien reports on the return of a once endangered species: the gray wolf. Is it a growing and threatening predator or a pivotal player to the ecosystem of the Western U.S.? O'Brien and his team traveled…

Sep 19

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The Return of the Gray Wolf

Science correspondent Miles O'Brien reports on the successful return of a once endangered species now caught in the crosshairs of cattle ranchers.

The wrong kind of earthworm can upset the chemistry and nutrient dynamics of soil, damaging plant and tree growth, scientists say. Researchers have linked an invasive species of earthworms to stunted tree growth in parts of the Western…