SMSA brief history of U.S. holiday observations.
Why do we have federal holidays? We give a brief, lyrical history of U.S. observations.
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Matt Rourke / APHow Effective Are Anti-Depressants?
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Sergei Grits / APHow Can Animals Detect How Humans Are Feeling?
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Charles Sykes / APWhen Is It Too Early To Play Christmas Music?
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Alex Brandon / APHow Can Earth Avoid An Asteroid Strike?
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Charles Krupa / APThe Potential Future Of Daylight Saving Time
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Ariana Cubillos / APWhy Does OPEC Control Oil Prices?
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Aijaz Rahi / APWhy Is The World Cup Being Played In The Winter?
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Ross D. Franklin / AP