Brazil's state of Tocantins has ruled out the occurrence of highly pathogenic avian influenza, known as bird flu, in a local ...

I don’t make the rules, but if Usher’s Confessions album or The O.C. Mix 1 was the soundtrack to your first kiss, your ...

Bioengineers from UC San Diego developed a simple technique of using bacteria as living test tubes to study human gene mutations and rapidly screen chemicals for their potential drug use. Image credit ...

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The erythrocyte sedimentation rate test observes how quickly red blood cells fall to the bottom of a test tube. During normal circumstances, these cells descend slowly through the plasma.

With the exception of "Editorial use only" photos (which can only be used in editorial projects and can't be modified), the possibilities are limitless. Learn more about royalty-free images or view ...