Today is the day the United States commemorates Martin Luther King, Jr. birthday. Two days ago, January 15th, was his 82nd birthday. Martin Luther King, Jr. died on April 4, 1968 and I am sure everyone knows about his life. If for some reason you have not, please read his Wikipedia page.
Today, on Google.com there is a special logo for Martin Luther King, Jr. Day.
Clicking on the logo takes you to a set of search results for [Martin Luther King, Jr.].
Google is not the only place you can find a special logo for MLK. You can also see them on Yahoo, Bing and Dogpile: