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The average performance of the lowest income students in the United States lags about three to four years behind that of the highest income students — an achievement gap that has remained constant for more than four decades, a new study finds.

An analysis of standardized tests given to more than 2.7 million middle and high school students over almost 50 years suggests that federal...

THE WOODLANDS, Texas — Ultima Thule’s history may be written in the sum of its parts.

New analyses suggest that the tiny space rock formed from a rotating cloud of even smaller rocks that collapsed into two individual objects. Those objects then gently collided in the early days of the solar system, creating the distant double-lobed world studied by the passing New Horizons spacecraft,...

A tiny new frog species discovered in tropical forests of southwest India has been one of a kind for millions of years.

Palaniswamy Vijayakumar and his colleagues first spotted the new species one night in 2010 while surveying frogs and reptiles roughly 1,300 meters up in India’s Western Ghats mountain range. The frog hardly stood out — its brown back, orange belly and starlike spots...

“What you’re about to experience is Yellowstone as it’s rarely seen,” actor and Montana resident Bill Pullman says in the opening narration of a new documentary. Smithsonian Channel’s Epic Yellowstone, a four-part series that airs this month and will be available via several streaming services, puts Yellowstone National Park’s recovering ecosystem into the limelight. The park went nearly half...