* 1953 – James D. Watson and Francis Crick announce to friends that they have determined the chemical structure of DNA ; the formal announcement takes place on April 25 following publication in April's Nature ( pub.

The discovery was made on 28 February 1953 ; the first Watson / Crick paper appeared in Nature on 25 April 1953.

Sydney Brenner, Jack Dunitz, Dorothy Hodgkin, Leslie Orgel, and Beryl M. Oughton, were some of the first people in April 1953 to see the model of the structure of DNA, constructed by Crick and Watson ; at the time they were working at Oxford University's Chemistry Department.

* April 25 – Francis Crick and James D. Watson publish " Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid ", their description of the double helix structure of DNA.

The discovery was made on 28 February 1953 ; the first Watson / Crick paper appeared in Nature on 25 April 1953.

Sydney Brenner, Jack Dunitz, Dorothy Hodgkin, Leslie Orgel, and Beryl M. Oughton, were some of the first people in April 1953 to see the model of the structure of DNA, constructed by Crick and Watson ; at the time they were working at Oxford University's Chemistry Department.

Watson and Crick published their proposed DNA double helical structure in a paper in the journal Nature in April 1953.

Together with Jack Dunitz, Dorothy Hodgkin, Leslie Orgel, and Beryl M. Oughton, he was one of the first people in April 1953 to see the model of the structure of DNA, constructed by Francis Crick and James Watson ; at the time he and the other scientists were working at Oxford University's Chemistry Department.

Together with Sydney Brenner, Jack Dunitz, Dorothy Hodgkin, and Beryl M. Oughton he was one of the first people in April 1953 to see the model of the structure of DNA, constructed by Francis Crick and James Watson, at the time he and the other scientists were working at Oxford University's Chemistry Department.

The discovery was made in Cambridge on February 28, 1953 ; the first Watson / Crick paper appeared in Nature on April 25, 1953.

" Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid " was an article published by James D. Watson and Francis Crick in the scientific journal Nature in its 171st volume on pages 737 – 738 ( dated April 25, 1953 ).

The lyrics were written in honor of Green Beret James Gabriel, Jr., the first Native Hawaiian who died in Vietnam, who was executed by the Viet Cong while on a training mission on April 8, 1962.

On 20 April 1899 Beatty was appointed executive officer of the small battleship HMS Barfleur, flagship of the China Station, Captain Stanley Colville under Rear-Admiral James Bruce.

The duke then set out for the Shrine of Saint James of Compostela, in the company of other pilgrims ; however, he died on Good Friday 9 April 1137.

In April 1772, when James Northcote saw her Miss Notable in Cibber's The Lady's Last Stake, he remarked to his brother " I never saw a part done so excellent in all my life, for in her acting she has all the simplicity of nature and not the least tincture of the theatrical ".

In April 1962 Grenada's Administrator, the Queens representative on the island, James Lloyd suspended the constitution, dissolved the Legislative Council, and removed Eric Gairy as Chief Minister, following allegations concerning the Gairy's financial impropriety.

In April 1687, James ordered the fellows of Magdalen College, Oxford to elect a Catholic, Anthony Farmer, as their president.

In April 1688, James re-issued the Declaration of Indulgence and ordered all clergymen to read it in their churches.

American chemist and inventor James Bert Garner is credited by American sources with the invention of the gas mask in April 1915.

Before Hawks was called for active duty, he took the opportunity to go back to Hollywood and by the end of April 1917 was working on Cecil B. DeMille's The Little American, where he met and befriended the then eighteen-year-old slate boy James Wong Howe.

In April, the ABC's new nightly current affairs program This Day Tonight ran a story which criticised the government's decision not to reappoint the Chair of the ABC Board, Sir James Darling.

The newly hailed " James Brown Band " debuted at the Apollo Theater on April 24, 1959, opening for Little Willie John.

On April 2, 2010, James Gosling resigned from Oracle.

James Monroe ( April 28, 1758 – July 4, 1831 ) was the fifth President of the United States ( 1817 – 1825 ).

James Monroe was born on April 28, 1758, in his parents ' house located in a wooded area of Westmoreland County, Virginia.

John James Audubon ( Jean-Jacques Audubon ) ( April 26, 1785 – January 27, 1851 ) was a French-American ornithologist, naturalist, and painter.

James Scarlett, 1st Baron Abinger ( 13 December 1769 – 17 April 1844 ) was an English lawyer, politician and judge.

On Saturday, April 30, 1803, the Louisiana Purchase Treaty was signed by Robert Livingston, James Monroe, and Barbé Marbois in Paris.

James Fergason, while working with Sardari Arora and Alfred Saupe at Kent State University Liquid Crystal Institute, filed an identical patent in the United States on April 22, 1971.

Mary, born at St. James's Palace in London on 30 April 1662, was the eldest daughter of James, Duke of York ( the future James II & VII ), and his first wife, Lady Anne Hyde.

On April 25, 1995, James Nichols was also arrested, but he was released after 32 days due to lack of evidence.

Occidental College was founded on April 20, 1887, by a group of Presbyterian clergy and laymen, including James George Bell.

Honorius IV acknowledged neither the one nor the other: on 11 April 1286, he solemnly excommunicated King James II of Sicily and the bishops who had taken part in his coronation at Palermo on 2 February.

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In April 2007, Borland announced that it would be relocating its headquarters and R & D facilities to Austin, Texas.

He surrounded Donald Duck and nephews Huey, Dewey and Louie with a cast of eccentric and colorful characters, such as the aforementioned Scrooge McDuck, the wealthiest duck in the world ; Gladstone Gander, Donald's obscenely lucky cousin ; inventor Gyro Gearloose ; the persistent Beagle Boys ; the sorceress Magica De Spell ; Scrooge's rivals Flintheart Glomgold and John D. Rockerduck ; Daisy's nieces April, May and June ; Donald's neighbor Jones, and The Junior Woodchucks organization.

Saint Catherine of Siena, T. O. S. D, ( 25 March 1347 in Siena – 29 April 1380 in Rome ) was a tertiary of the Dominican Order, and a Scholastic philosopher and theologian.

* Development of other content distribution networks on the internet through P2PTV ; EBU Project Group D / P2P, from November 2007 to April 2008, with a trial of selected member channels, thanks to Octoshape's distribution platform.

The Greens founded the first international chapter of a German political party in the U. S. on April 13, 2008 at the Goethe-Institut in Washington D. C. Its main goal is " to provide a platform for politically active and green-oriented German citizens, in and beyond Washington D. C., to discuss and actively participate in German Green politics.

A new government was formed by the Democrats of the Left leader and former communist Massimo D ' Alema, but in April 2000, following poor performance by his coalition in regional elections, D ' Alema resigned.

On April 6, 1965, Intelsat ’ s first satellite, the Intelsat I ( nicknamed Early Bird ), was placed in geostationary orbit above the Atlantic Ocean by a Delta D rocket.

Goebbels knew how to play on Hitler's fantasies, encouraging him to see the hand of providence in the death of United States President Franklin D. Roosevelt on 12 April.

John Wilkes Booth ( May 10, 1838 – April 26, 1865 ) was a famous American stage actor who assassinated President Abraham Lincoln at Ford's Theatre, in Washington, D. C., on April 14, 1865.

On April 19, 1909, the Biograph Company director D. W. Griffith screen-tested her at the company's New York studio for a role in the nickelodeon film Pippa Passes.

He received his Ph. D. in April 1930 for a thesis on alternative algebras.

On April 4, 2006, Abdul filed a report at a Hollywood police station claiming she had been a victim of battery at a private party at about 1 a. m. April 2, according to L. A. P. D.

On April 3, 2009, Run – D. M. C.

On April 17, 2012, Discovery was transported by Shuttle Carrier Aircraft to Dulles from Kennedy Space Center, where it made several passes over the Washington D. C. metro area.

In recognition of his distinguised services to the Victorian community, he was awarded the degree of Doctor of Laws ( honoris causa ) – LL. D ( h. c .) by Deakin University on 27 April 2010.

The New York City Center birthday celebration and benefit concert on April 26, 2010 featured ( in order of appearance ): Michael Cerveris, Alexander Gemignani, Donna Murphy, Debra Monk, Joanna Gleason, Maria Friedman, Mark Jacoby, Len Cariou, B. D.

Richard Rush of Pennsylvania, a representative of President Jackson who helped to present a compromise to both governors. On April 3, 1835, Jackson sent two representatives from Washington, D. C., Richard Rush of Pennsylvania and Benjamin Chew Howard of Maryland, to Toledo to arbitrate the conflict and present a compromise to both governments.

* April 9 – African-American singer Marian Anderson performs before 75, 000 people at the Lincoln Memorial in Washington, D. C., after having been denied the use both of Constitution Hall by the Daughters of the American Revolution, and of a public high school by the federally controlled District of Columbia.

* April 3 – Richard D ' Oyly Carte, English impresario ( born 1844 )

* April 12 – United States President Franklin D. Roosevelt dies suddenly at Warm Springs, Georgia ; Vice President Harry S. Truman becomes the 33rd President.