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.
1838 Matthias Schleiden-First to observe and report that all plants were composed of cells. 1839 Theodore Schwann-First to observe and report that all animals were composed of cells. Theodore Schwann and Schleiden are attributed to the first two points of the Cell Theory.