he general consensus on hydration is that gulping eight glasses of water a day is necessary for health. What we tend to forget while tallying the ounces is how much of a role the liquid has played in the development of Earth as we know it.

Author Brian Fagan dives deeper into the crucial fluid in his latest anthropological hardcover, Elixir: A History of Water and Humankind, which stories the compound element’s impact on evolution in three parts.

Fagan will discuss and sign his book at Changing Hands.

Tue., Nov. 22, 7 p.m., 2011
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