Uralic languages impetus from the fact that these languages, unlike most of the other languages spoken in Europe, are not part of what is now known as the Indo-European family. In 1717, Swedish professor Olof Rudbeck proposed about 100 etymologies connecting Finnish and Hungarian, of which about 40 are still considered valid. Several early reports comparing Finnish or Hungarian with Mordvin, Mari or Khanty were additionally collected by Leibniz and edited by his assistant Johann Georg von Eckhart. In 1730, Philip Johan von Strahlenberg published his book ("The North and East Parts of Europe and Asia"), surveying the geography, peoples and languages
Uralic languages three families where gradation "is" found) is noted by Helimski (1995): an original allophonic gradation system between voiceless and voiced stops would have been easily disrupted by a spreading of voicing to previously unvoiced stops as well. A computational phylogenetic study by Honkola, et al. (2013) classifies the Uralic languages as follows. Estimated divergence dates from Honkola, et al. (2013) are also given. Structural characteristics generally said to be typical of Uralic languages include: Basic vocabulary of about 200 words, including body parts (e.g. eye, heart, head, foot, mouth), family members (e.g. father, mother-in-law), animals (e.g. viper, partridge, fish), nature