Scientists discovered true teeth growing on the head of the spotted ratfish, a distant shark relative. The toothed structure, called a tenaculum, helps males hold onto females during mating. Genetic ...

Air pollution isn’t always visible, but it affects nearly every breath taken indoors. Floating in the air are tiny particles ...

Conversely, it shouldn't be dripping. Liquid or discharge flowing out of your dog's nose could be a sign of illness, ...