In a study of 43 men who had recovered from COVID-19, nearly 20% had azoospermia, or the total absence of sperm in semen.
SpaceX's Crew-1 astronauts have now spent more time in space than the crew of any other mission launched from U.S. soil.
A medieval ship burial in England is now captivating viewers of the Netflix drama "The Dig." But who is actually buried at the 1,400-year-old site known as Sutton Hoo?
Part of a glacier collapsed in the Indian Himalayas, triggering an avalanche that destroyed one dam and damaged another. Hundreds are feared missing or dead.
Tackling the climate crisis is one of President Joe Biden's top priorities, and NASA has created a new role to match.
We don't know why the universe is dominated by matter over antimatter, but there could be entire stars, and maybe even galaxies, in the universe made of antimatter.
The mystery at the heart of an unexplained, bright point of gamma-ray light in the sky has been solved: a violent, whirling redback.
China's Tianwen-1 spacecraft snapped its first image of Mars as the mission makes its final approach; the probe will enter orbit around the Red Planet in less than a week.
A weird, super-powerful particle that's not truly a particle could have dominated the universe when it was just a second old, releasing a flood of ripples that permeated all of space-time.
Mouse sperm carrying a genetic sequence called the t-haplotype will poison their competitors, then make an 'antidote' only for themselves, new research finds.
Scientists recently animated the hazards of being a blue whale that's trying to avoid collisions with ships at sea.
Amid a shortage of vaccine supplies and the threat of emerging coronavirus variants, such an approach might provide an answer for both.