Interestingly, the world’s oldest known boomerang was found over thirty years ago in Poland. This is a bit off topic but since the site deals with prehistory, might just as well go deep once in a while.
The boomerang was found in the Obłazowa Cave (Jaskinia Obłazowa) in Nowa Biała near Nowy Targ by a team led by Paweł Valde-Nowak. It was described in Nature magazine.
The boomerang is apparently 23k-30k years old and was made from a mammoth tusk. More recent work in the cave produced finds related to the Micoquien culture – these are dated at 50k-60k. However, even older finds firmly establish settlement at 80k-100k thereby proving that Slavic Polish settlement of central Europe preceded even that of the Neanderthals (likely Germanic ancestors, of course, ;-)). 
Given the hostile climate, not to mention the various predators and other dangers it is little wonder that so many humans must have loved the relative shelter of such caves. My guess is people lived their entire lives in some of these (if they were lucky). They ate, slept and had sex there. They might have had wars over who gets to keep a cave (inheritance fights? neighboring tribes?). Cool stuff.
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