Fantastic article on what life is and whether we can find it elsewhere. Biology and life itself drives me crazy and I want to see the discovery of other or similar life forms before I die. The authors ask all the questions you could possibly ask. If you are one of those who ask "Why?" a lot, this article is definitely for you.
http://www.sciencedirect.com/science/article/pii/S1367593104001358
Why 20 amino acids?
Why 4 DNA bases?
Why carbon?
Why water?
Could any other solvent support life?
and tens of other questions are really well explained here. The references are so great that I will probably end up reading 50 of them.
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