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Clues suggest the North is developing thermonuclear fuels, particularly to enhance its atom bombs.

The genes account for just a tiny fraction of the variation in test scores, experts say. Many are yet to be found, and environmental factors are also greatly important.

Paleontologists calculated the bite force of the fearsome prehistoric predators and provided more evidence that they were opportunistic scavengers.

Researchers think they may have found a clue for why the critically endangered apes nurse longer than any other mammal: environmental fluctuations in food.

Seven decades after she began, Dr. Milner continues to explore the biology of memory and how the brain’s many parts function together.

The agency announced that adding astronauts to the mission would have cost $600 to $900 million and required significantly more work and time.

The cells of Japan’s Amami spiny rat have unusual sexual flexibility, a possible clue to how the animal differentiates into female and male sexes, new research suggests.

A series of experimental “mesocosms” in Australia show that a warming world will have unexpected effects on marine ecosystems.

The Sesame Institute will use synchrotron light to study materials ranging from exotic semiconductors to viruses.

Packs of the animals, once endangered, have flourished, but biologists worry about the effects of renewed hunting outside the national park.