Scientists have offered a new explanation for why COVID-19 vaccines that contained adenoviruses carried a rare-but-serious risk of blood clotting.
Clouded leopards can rotate their ankle joints by almost 180 degrees and they kill prey by biting the back of their necks with their huge teeth.
A house in Australia harbored more than 400 moths and butterflies, and hundreds of other species, including ones never documented before.
The island forged in fire off the coast of Japan in Oct this year is still growing, as seen in a Copernicus Sentinel-2 image caught on Nov. 27.
Halley's Comet is predicted to reach its farthest point from the sun on Dec. 9, beginning a 38-year journey toward Earth that culminates in 2061.
A fifth century Mongolian saddle is one of the earliest examples of evidence of modern horse riding.
Drug regulators have approved a CRISPR therapy called Casgevy to treat inherited blood disorders. But what is it and how does it work?
The FDA approved two new therapies for sickle-cell disease, including the world's first-ever approved CRISPR therapy.
The announcement comes after the FDA became aware of more than 40 cases of "DRESS syndrome" linked to the seizure medications levetiracetam and clobazam.
Ancient workers used a blend of organic materials such as mosses and lichen to build the architectural marvel and help protect it from erosion.
Paleontologists have found two pairs of hind legs from a small, bird-like dinosaur in the stomach of a juvenile Gorgosaurus unearthed in Canada. It is the first time that any food remains have been discovered within a tyrannosaur.
Doctors have described a potential new syndrome seen in infants whose mothers used nonprescription fentanyl during pregnancy.
Newborns' brains may look relatively smaller than those of other primate babies, but it's not because they're "underdeveloped" by comparison.
Five axes found in Poland date to 3,500 years ago, and may have been used as either tools to chop wood or for sacrificial purposes.
NASA astronaut Frank Rubio spent hours looking for a tomato that floated away on the International Space Station. Eight months later, his colleagues finally found it.
Agitation, anxiety and depression seen in people with Alzheimer's may be driven by brain inflammation, in addition to abnormal proteins.
As many as 120 'shooting stars' per hour will be visible during the moonless peak of the Geminid meteor shower on Dec. 13 and 14.