The Google home page is featuring a logo for the 150th birthday of L. L. Zamenhof. L. L. Zamenhof is known for inventing a constructed language designed for international communication known as Esperanto. According to Wikipedia, Esperanto is used by 100,000 and 2 million speakers for over a century and has 1,000 native speakers but was never adopted by a country as their official language.
Google is the only major search engine to have a portal page just for this language, it can be found google.com/intl/eo/.
There are some people upset with Google that they picked a logo for Zamenhof over a logo for the U.S. Bill of Rights, which went into effect 218 years ago, today.