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Re:Symbols Found in Ice Age Caves Across Europe (2015) by pbhjpbhj on Wednesday December 27, 2017 @09:40AM (#16014974)
"(W)e don't know exactly how it was done" is exactly what "unexplained mystery" means.
Re:Symbols Found in Ice Age Caves Across Europe (2015) by tomcooks on Wednesday December 27, 2017 @01:39PM (#16016853)
As opposed to explained mysteries? /s
Re:Symbols Found in Ice Age Caves Across Europe (2015) by pbhjpbhj on Wednesday December 27, 2017 @07:08PM (#16019244)
An explained mystery would be something for which the method would be non-obvious, but nonetheless the method was known. Like a magic trick the solution of which were pubic knowledge - mysterious but explained in sources in the public domain.
Re:Symbols Found in Ice Age Caves Across Europe (2015) by rebuilder on Friday December 29, 2017 @11:08AM (#16030119)
So what's something where we can come up with several plausible methods, but don't have the evidence to conclusively decide which method actually was used?