Jennifer Nalewicki

Surgeons successfully transplanted pig hearts into brain-dead patients, advancing toward the next stage of FDA trials.

"Exceptional" treasure trove of ancient Roman gold coins found in the United Kingdom.

Paleontologists found dozens of astonishingly well-preserved fossils of a three-eyed Cambrian creature, at a site in British Columbia in Canada.

An unusual surge in anchovy populations has led to the fish raining down on San Francisco. Here's why.

A jawbone fossil from an extinct predator that resembled both bears and dogs, confirmed how widespread these carnivores were millions of years ago.

NASA is trying to reclaim its "one-of-a-kind' Apollo rarity" — an auction lot containing moondust and cockroaches.

An herbivorous dinosaur used its vicious-looking claws to forage for plants near the shores of Cretaceous seas.

Scientists recently linked elevated stress levels in male mice to a compound found in females' urine — and bananas.

A NASA satellite recently spied the underwater eruption of a submerged volcano where sharks make their home.

Scientists recently discovered fossils in Argentina that belong to Thanatosdrakon. The specimens are the largest pterosaurs ever found in South America.

Large torsos helped streamline swimming in giant long-necked extinct marine reptiles that swam Earth's oceans during the Mesozoic.

An extinct arthropod with stilt-like limbs that lived during the Ordovician period was recently described from an exceptional fossil found in Canada.