A rock had a steak on a cutting board seasoned with some peppercorns, salt, and rosemary - Belashova/Shutterstock Although we don't spend much time thinking about it, we rely heavily on the system of ...

Pus is a thick yellowish, whitish, or greenish fluid made up of dead white blood cells, dead tissues, and dead bacteria or fungi. Also called liquor puris or purulent exudate, it is produced as part ...