Anthony van leeuwenhoele (1673) is known for the best microscope for his time. Made people such as the dutch royalty interested in looking at things . Robert hooke coined the word cell as the tiniest living system. Called it a cell because it looked like a cell in a bee hive. Stero-scanning microscopes used to look at surface of specimen. Light microscopes and electron microscopes are used to look inside specimen. Light microscopes has resolution limit of about 0. 2 microns. Done by use of centrifuge with spins the specimen. The spinning causes certain elements of the cell to fall to bottom depending on density of organelle and speed of centrifuge. A cell is the simplest collection of matter, which has all components of life: lowest hierarchical level which is alive, cell is the basic unit of life, cells preform all functions necessary to live and reproduce. Some wreck havoc others cause no disease or outwards sign of their presence.