Teeth

In most Slavic languages "zub" means tooth. Officially it comes from Proto-Slavic "*zǫbъ" from Proto-Balto-Slavic "*źámbas" from PIE "*ǵómbʰos"... 

Hmmm... 

Sumerian word for teeth is "zú"....

Sumerian language was attested from the late 4rd millennium BC, but is probably much older. It is officially not related to IE languages... 

Based on statistical analysis (???) as we have no written sources, Indoeuropean (IE) languages starting branching out from the hypothetical Protoindoeuropean (PIE) language some time between mid 5th and mid 4th millennium BC 

Officially, Slavic languages are much younger and branched out much later, some time after the early 2nd millennium BC...

How come then Slavic "zubi" (teeth) has the same root as Sumerian "zú" teeth? Another ancient root miraculously preserved in "young" Slavic languages?

Just like words for Mind, Writing, Grain, Life, Breath, Grain devouring insect, Sickle whose roots are the same in Slavic languages and Sumerian...

Mystery...