1. 1849: In New York City, James Knox Polk becomes the first serving President of the United States to have his photograph taken.

2. 1924: The Computing-Tabulating-Recording Company (CTR) is renamed IBM (International Business Machines Corporation).

3. 1929: The “St. Valentine’s Day Massacre” occurred in Chicago, where seven members of the Bugs Moran gang were gunned down by Al Capone’s gang.

4. 2005: The video-sharing website YouTube was launched.