You can see, smell, and taste microorganisms. This is false. Microorganisms are very tiny one-celled organisms, viruses, fungi, and bacteria, and are found everywhere in the world. They are found in all living things, plants and animal. There are more microorganisms on and inside your body than there are cells that make up your entire body.
http://library.thinkquest.org/CR0212089/micr.htm