When we can't describe how we're feeling, we say we "have no words."  But in his made-up dictionary, writer John Koenig has invented words to describe our most abstract and ephemeral emotions.

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Did past generations experience and express emotions the same way we do?  Probably not, says historian Tiffany Watt Smith -- perceptions of our emotions depend on the time and place.

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Identifying basic emotions in others -- like fear, sadness or anger -- seems instinctive, but psychologist Lisa Feldman Barrett says we're doing more guesswork than we think.

 Conductor Michael Tilson Thomas traces the history of classical music, revealing its power to present a variety of complex human emotions.

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