SMITHSONIAN WORLD
PBS (8-9 p.m. ET)
Historian David (Mornings on Horseback) McCullough is the Alistair Cooke for this informative series drawing on the collections of the Smithsonian Institution. In the first program, McCullough visits a giant telescope on the summit of Mount Hopkins in Arizona, and a private museum of clocks in Rockford, Ill. to illustrate the concepts of light and time.
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