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in that periodic column table if the conditions were right, everything over here you could put you could change one for the other, arsenic for phosphorous. if you may remember there s a couple of science-fiction stories that has silicon exchange for carbon which is not so easy. this idea that it s to substitute things changes the way we look at living things and changes the way we think about what s possible. like your what you thought of as the possible world has now been expanded. there s a great description, bill of the science. jill, let s take it out of the science realm and discuss the implications of this. first we were talking about microbes. they looked like potatoes. what does this mean in terms of alien life? by definition this is alien life because it s not like bill said

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