Basically, spectrographical analysis of Titan show the absence of chemicals that should be there (hydrogen and acetylene). One of the explanation for this absence is a previously suggested chemical metabolism that would allow local microbe to extract energy from their environment. Acetylene would be created by UV radiation affecting Titan's
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Last evening, the weather just was so nice I had to fire up the BBQ for the first time. I undercooked the steak, but hey, rare is still good! (if a bit disturbing - you just don't have to think too much while eating
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