Here is a segment of what happened on this day in history.
'Tsinghua University is a national public research university in Beijing, China. The university is funded by the Ministry of Education. Tsinghua University is a member of the C9 League. It is also a member of the Double First-Class University Plan, Project 985 and Project 211. Since its establishment in 1911, it has produced many notable leaders in science, engineering, politics, business, academia, and culture.'
About the Los Angeles public library.
'The Los Angeles Public Library system (LAPL) serves the residents of the City of Los Angeles. The system holds more than six million volumes, and with around 19 million residents in the Los Angeles Metropolitan area, it serves the largest population of any public library system in the United States. The system is overseen by a Board of Library Commissioners with five members appointed by the mayor of Los Angeles in staggered terms.'
"The wedding of Prince William and Catherine Middleton took place on 29 April 2011 at Westminster Abbey in London, England. The groom was second in the line of succession to the British throne. The couple had been in a relationship since 2003.
The ceremony was attended by the bride's and groom's families, as well as members of foreign royal families, diplomats, and the couple's chosen personal guests. After the ceremony, the couple made the traditional appearance on the balcony of Buckingham Palace. As Prince William was not the heir apparent to the throne, the wedding was not a full state occasion and many details were left to the couple to decide, such as much of the guest list of about 1,900."
About 3D television.
"3D television (3DTV) is television that conveys depth perception to the viewer by employing techniques such as stereoscopic display, multi-view display, 2D-plus-depth, or any other form of 3D display. Most modern 3D television sets use an active shutter 3D system or a polarized 3D system, and some are autostereoscopic without the need for glasses. As of 2017, most 3D TV sets and services are no longer available."
"Space Patrol is an American science fiction adventure series set in the 30th century that was originally aimed at juvenile audiences via television, radio, and comic books. It was broadcast on ABC from March 1950 to February 1955. It soon developed a sizable adult audience, and by 1954 the program consistently ranked in the top 10 shows broadcast on a Saturday."
Information source- Wikipedia.com