The following book has more criticism of arsenic life, but it also covers other extremophiles and discusses research into many strange froms lilving under very different environments than on the surface of the Earth: > > http://online.wsj.com/article/SB10001424052748704495004576264902966836830.html?KEYWORDS... article. No such thing as arsenic life:-http://wavefunction.fieldofscience.com/2012/06/its-finally-official-arsenic-life-does.html