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Must Life Drink Water?

Star Trek used to portray aliens made up of different stuff than the carbon and water chemistry which comprises Earth-based life.  For years, most scientists who considered the possibility of life in space, including Carl Sagan and Stanley Miller, admitted, somewhat reluctantly, that the periodic table of the elements admits no practical alternatives to water […]

Photosynthesis Began a Billion Years Earlier Than Thought

According to the BBC News, some scientists have pushed back the evolution of photosynthesis a billion years earlier than previously believed, to 3.9 billion years ago.  This is based on uranium-thorium ratios of rocks in Greenland that led Danish researchers to conclude that they were deposited under oxidizing conditions.  Others are not sure the data […]
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