The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view. In contemporary writing parallax can also be the same story, or a similar story from approximately the same time line, from one book told from a different perspective in another book.
In 1838, Theodor Schwann and Matthias Schleiden were enjoying after-dinner coffee and talking about their studies on cells. It has been suggested that when Schwann heard Schleiden describe plant cells with nuclei, he was struck by the similarity of these plant cells to cells he had observed in animal tissues.
<b>Anton van Leeuwenhoek , a dutch merchant, discovered the single celled organism.</b><b>He was a microscope seller and he decided to take a look at pond scum.</b> <b>He saw that they were small animals.</b><b>He named them <i>animalcules</i> which means small animal.</b> <b>Today we call animalcules single celled organisms.