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| | Today in History: December 21 |
 | | In the Northern Hemisphere, winter begins on the "shortest day" of the year, December 21 or 22, and lasts until March 20 or 22, the beginning of spring, marked by the vernal equinox, when day and night are equal in length. |
 | | On December 21, 1928, President Calvin Coolidge signed the Boulder Canyon Project Act intended to dam the fourteen hundred mile Colorado River and distribute its water for use in Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming. |
 | | At 5:30 P.M. on December 7, 1941, Hoover dam was closed to the public and traffic moved over the dam only under convoy for the duration of World War II. |
| lcweb2.loc.gov /ammem/today/dec21.html (2012 words) |
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