There's no 'mystery' (to/as to/about) why we're here. = It's no 'mystery' why we're here. [=we know why we are here]
His success is something of a 'mystery'. = His success is a bit of a 'mystery'.
We'll reveal the identity of today's 'mystery' guest after these commercials.
(..) autotrophs began to drool, neanderthals developed tools we built the wall we built the pyramids math, science,history, unraveling the mystery that all started with a big bang bang! THE BIG BANG THEORY Season Episode proudly presents sync:YTET-cflily (..)2007 TvShow: The Big Bang Theory Title: The Fuzzy Boots Corollary Season: 1 Episode 3