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Repost from my photography blog. What you see is some gold being melted with a hydrogen/oxygen torch. When you burn hydrogen the byproduct besides the extreme heat is water vapor.
The ounces of water made when we made this gold was soon part of a storm that brought spring rains. To some men, the gold that became jewelry is the valuable thing. To a farmer the water is the value of the work that day. To a man lost in the desert water is the only treasure worth seeking.