Life as we know it can survive without sunlight and oxygen: witness the creatures that populate the sulfurous vicinity of submarine hydrothermal vents. Life as we know it cannot live without water, and where there is water, there is almost always life.“I discovered living creatures in rain, which had stood but a few days in a new tub,” Antonie van Leeuwenhoek observed in 1675 after peering through his invention, a new and better microscope. A grown man like Pablo Valencia can last three weeks without food; without water, at most several days.
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