Taxonomy (biology) new common (or apomorphic) traits. However, certain phenetic methods, such as neighbor joining, have found their way into cladistics, as a reasonable approximation of phylogeny when more advanced methods (such as Bayesian inference) are too computationally expensive. Modern taxonomy uses database technologies to search and catalogue classifications and their documentation. While there is no commonly used database, there are comprehensive databases such as the "Catalogue of Life", which attempts to list every documented species. The catalogue listed 1.64 million species for all kingdoms as of April 2016, claiming coverage of more than three quarters of the estimated species known to
Carl Linnaeus the Younger head of Practical Medicine at Uppsala. His promotion to professor—without taking exams or defending a thesis—caused resentment among his colleagues. Linnaeus' work was modest in comparison to that of his father. His best-known work is the "Supplementum Plantarum systematis vegetabilium" of 1781, which contains botanical descriptions by the elder Linnaeus and his colleagues, edited and with additions by the son. He took a two-year trip to England, France, The Netherlands and Denmark between 1781-1783. In London he had laid the ground for sickness (jaundice), and shortly after his return, he suffered the fever and stroke from which he died at