> The Earth is the edge case You do not know that. All available evidence points to the opposite: We have no knowledge, not even a hint, of any other physical

> The Earth is the edge case You do not know that. All available evidence points to the opposite: We have no knowledge, not even a hint, of any other physical process that could sustain life than that of Earth's carbon-based chemistry. The idea that life could take a myriad of different forms is beautiful, but it is pure fantasy, based on no evidence at all.