A fin whale with a deformed spine was recently spotted struggling to swim off the coast of Spain. Its back was likely broken during a vessel strike, experts say.
Only a few people have been cured of HIV, but scientists are working to develop cures that could be accessible to more of those infected.
Dogs commonly tilt their heads, but is it a sign of intelligence, or does it mean something else entirely?
Astronomers used NASA's Chandra X-ray Observatory to spot two pairs of gigantic black holes set for two separate, first-of-their-kind collisions.