* 1974 – The Super Outbreak occurs, the second biggest tornado outbreak in recorded history ( after the April 25-28, 2011 tornado outbreak ).

** Ai Weiwei ( born 1957 ), Chinese artist, curator, architectural designer, cultural and social commentator, dissident, disappeared April 2011

On April 28, 2011 Georgia Governor Nathan Deal signed legislation allowing local communities to vote on whether to allow alcohol sales on Sundays.

After the second terminal of International Airport Sofia was built the total number of passengers rose and reached 3 230 696 in 2008, and in April 2011 Airport Sofia serviced 282 694 passengers, 13 % more than the same period of 2009, when the record was 250 000 passengers.

| 18 April 2011

On April 18, 2011, it was reported that a military mutiny in Burkina Faso had spread to a fourth city, Kaya, after demonstrations in Po and Tenkodogo.

On 22 April 2011, French culture minister Frédéric Mitterrand officially inscribed bullfighting on a list enumerating the country's cultural heritage, a decision which Bardot is currently publicly contesting.

In April 2011, a representative for Andrews McMeel received a package from a " William Watterson in Cleveland Heights, Ohio ", which contained a 6 " x 8 " oil-on-board painting of Cul De Sac character Petey Otterloop, done by Watterson for the Team Cul de Sac fundraising project for Parkinson's Disease.

The movie was first aired on April 17, 2011.

On 15 April 2011, a day before his 122nd birthday anniversary, Google celebrated him with a special Google Doodle video on its global and other country-wide homepages.

The latest census in Croatia was performed in April 2011.

In April 2011, Chaosium and new developer Red Wasp Design announced a joint project to produce a mobile video game based on the Call of Cthulhu RPG entitled Call of Cthulhu: The Wasted Land.

On April 12, 2011, she played live through video link for the audience of Jethro Tull's show in Russia in honour of the 50th anniversary of Yuri Gagarin's flight.

In April 2011, Limehouse Library having closed in 2003, the Attlee statue was unveiled in its new home at Queen Mary University of London.

In November 2011, Charles took time off from Coronation Street to film a new series of Red Dwarf, returning to filming on ' Corrie ' in April 2012.

In April 2011 the Columbia University Senate voted to welcome the ROTC program back on campus.

* On 3 April 2011, Fulham unveiled a statue of Michael Jackson inside the stadium before its match with Blackpool.

This started in April and would develop during the year and into early 2011.

The last census was taken in 2011 ( from April 1 to April 28 ).

But due to some internal problems, the census was delayed till start of 2011 and its first phase was started in April allover the country.

The 2011 Cricket World Cup was co-hosted by Bangladesh, India, and Sri Lanka from 19 February to 2 April 2011.

According to the project's Facebook group, the English-language DVD has been released in Denmark on April 16, 2011 and is available internationally through the website forlaget-afart. dk /.

The book was originally made as a gift by papersera. net for Rosa himself upon the occasion of Rosa's April 2011 visit to Turin, Italy, and is available as a print-on-demand book from Lulu. com ( see link at papersera. net site on the book )

His exact date of death remains unclear as well, with most research pointing toward it being between April 14, 1202, and April 5, 1203.

On 14 April 2008, in a UK Channel 4 documentary, Tudor Parfitt, taking a literalist approach to the Biblical story, described his research into this claim.

In April 1958, he was appointed as a consultant to the House Committee on Astronautics and Space Exploration, which was preparing to hold hearings on President Eisenhower's proposal for a new agency to handle space research, and a month later received the Ohio State University's Distinguished Alumnus Award.

On April 19, 1988, Japanese telecommunications company NTT began offering nationwide ISDN services trademarked INS Net 64, and INS Net 1500, a fruition of NTT's independent research and trial from the 1970s of what it referred to the INS ( Information Network System ).

The research was published in the April 7 issue of Science.

In April 2011 Verizon helped Janet upgrade 4 central locations to run at 100Gbit / s bringing it to a national research and education network performance parity with Internet2 ( which upgraded its backbone to 100Gbit / s in October 2007 ).

Maximilian Karl Emil " Max " Weber (; 21 April 1864 – 14 June 1920 ) was a German sociologist, philosopher, and political economist who profoundly influenced social theory, social research, and the discipline of sociology itself.

In April of the same year, Dr. Leo Alexander had submitted to the Counsel for War Crimes six points defining legitimate medical research.

Following publication of a Letter to the Editor from Kranke and colleagues in April 2000, along with a non-specific response from Dr. Fujii, there was no follow-up on the allegation of data manipulation and no request for an institutional review of Dr. Fujii's research.

After reading Osmond ’ s paper, Huxley sent him a letter on 10 April 1952 expressing interest in the research and putting himself forward as an experimental subject.

* April 2 – The LexisNexis computerized legal research service begins.

* Webarchive: April 25, 1997 Sandia-led research may zap old beliefs about lightning protection at critical facilities ; Triggered lightning tests leading to safer storage bunkers

In South Africa, Aristide became an honorary research fellow at the University of South Africa, learned Zulu, and on 25 April 2007, received a doctorate in African Languages.

Until April 2012, he was a principal research scientist at Yahoo!

Roger Wolcott Sperry ( August 20, 1913 – April 17, 1994 ) was a neuropsychologist, neurobiologist and Nobel laureate who, together with David Hunter Hubel and Torsten Nils Wiesel, won the 1981 Nobel Prize in Medicine for his work with split-brain research.

Academician Andrey Petrovych Ershov (; 19 April 1931, Moscow – 8 December 1988, Moscow ) was a Soviet computer scientist, notable as a pioneer in systems programming and programming language research.

As of April 2011, the Bookshelf had 845 titles covering a wide range of topics including molecular biology, biochemistry, cell biology, genetics, microbiology, disease states from a molecular and cellular point of view, research methods, and virology.

No serious research was undertaken until the late 1880s when John Knox Laughton, the founder of the Navy Records Society, uncovered contemporary letters from Jamaica in September and October 1731 which substantiated Jenkin's account of his losing an ear to a Spanish Guarda Costa on 9 April 1731 ( Old Style ; 20 April New Style ).

On April 1, 1959, AMC and Sonotone Corporation announced a joint research effort to consider producing an electric car that was to be powered by a " self-charging " battery.

* The McNair Post-baccalaureate Achievement Program, which operates at 179 campuses in the U. S. ( April 7 ), awards research money and internships to first-generation and otherwise underrepresented students in preparation for graduate work.

* Stan Gronthos ( April 11, 1963 ) professor of stem cell research

* Medal " For Merit in Space Exploration " ( 12 April 2011 )-for great achievements in the field of research, development and utilization of outer space, many years of honest work, public activities