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Before the Internet, a good memory wasn't just useful; it was prized as a sign of intelligence. And there were memory geniuses who developed mental tricks for storing information. Philosopher and novelist Simon Critchley delves into the fascinating history of the memory palace, which once promised almost God-like wisdom.

Scientists are combing the universe for signs of exoplanets -- planets that orbit a star other than our sun.  They're finding them in record numbers.  Most believe it's only a matter of time before they find an exoplanet that can -- and perhaps does -- suppport life.  Sara Seager is a planetary scientist at M.I.T. and one of the pioneers of the field.