Question: On what topic did James Watson and Alex Stokes have papers published in "Nature" on 25 April 1953?
Context: The Raffles Bulletin of Zoology is a scientific journal published by the Raffles Museum of Biodiversity Research in Singapore.  It publishes papers on the taxonomy, ecology, and conservation of Southeast Asian fauna.  Two regular issues are published each year.  Supplements are published as and when funding permits and may cover topics that extend beyond the normal scope of the journal depending on the targets of the funding agency.  It is currently a hybrid open access journal with most of the papers published available online.  In time, all papers published by the "Raffles Bulletin of Zoology" will be made freely accessible to all.  The journal is largely supported by funding from the Faculty of Science, National University of Singapore. PLOS ONE (originally "PLoS ONE") is a peer-reviewed open access scientific journal published by the Public Library of Science (PLOS) since 2006.  The journal covers primary research from any discipline within science and medicine.  Operating under a pay-to-publish model, "PLOS ONE" publishes approximately 50% of submitted manuscripts.  All submissions go through a pre-publication review by a member of the board of academic editors, who can elect to seek an opinion from an external reviewer.  According to the journal, papers are not to be excluded on the basis of lack of perceived importance or adherence to a scientific field.  Although the number of submissions decreased from 2013 to 2014, "PLOS ONE" remained the world’s largest journal by number of papers published (about 30,000 a year, or 85 papers per day).  Numbers decreased further to 22,000 published papers in 2016, Alexander (Alec) Rawson Stokes (27 June 1919 – 5 February 2003) was a co-author of the second of the three papers published sequentially in "Nature" on 25 April 1953 announcing the presumed molecular structure of DNA.  The first was authored by Francis Crick and James Watson, and the third by Rosalind Franklin and Raymond Gosling.  The Nobel Prize in Physiology or Medicine was awarded in 1962 to Crick, Watson, and Wilkins for this work. Queer heterosexuality is heterosexual practice that is controversially called queer.  The concept was first discussed in the mid-1990s, critically within radical feminism, and as a positive identification by Clyde Smith in a paper delivered at a conference in Amsterdam in 1997; most papers cite these two as their entry point into the discussion.  In 2003 Village Voice published an article called "The Queer Heterosexual" which has been referred to in papers published since, as it delineates the territory covered by the term. Félix Ynduráin Muñoz (born January 18, 1946) is a Spanish condensed matter physicist and Professor at the Autonomous University of Madrid.  He has more than 120 research papers published.  Some of the centers where he has worked are the University of Cambridge,the University of California, Berkeley, the Thomas J. Watson Research Center, the Massachusetts Institute of Technology, the University of Paris-Sud and the Max Planck Institute for Solid State Research. National DNA Day is a holiday celebrated on April 25.  It commemorates the day in 1953 when James Watson, Francis Crick, Maurice Wilkins, Rosalind Franklin and colleagues published papers in the journal Nature on the structure of DNA.  Furthermore, on that day in 2003 it was declared that the Human Genome Project was very close to complete, and "the remaining tiny gaps [we]re considered too costly to fill." James Watson Webb II (known as James Sr.) (1884 – March 4, 1960) was an American polo champion.  He was a grandson of William Henry Vanderbilt and James Watson Webb. Ionia is a frame house near Trevilians, Virginia, that was the centerpiece of a large plantation in the late 18th and early 19th centuries.  Built around 1775, Ionia was the home of the Watson family.  It was built as Clover Plains by Major James Watson, the son of a Scottish immigrant, in a fertile area of Louisa County, Virginia that is now a National Historic Landmark District, the Green Springs National Historic Landmark District.  The plantation was the third largest in Louisa County in the late 18th century, leading to the nickname "Wheat Stacks" for Watson as a result of his prosperity.  After Major Watson's death in 1845 the house passed to his son, Dr. George Watson, who renamed the house "Ionia" and, since he lived in Richmond, used it as a summer residence.  George Watson died in 1854, leaving Ionia to his widow, who lived there until the 1870s.  Following her death in 1879 the property was subdivided.  The Watson family went on to build a number of houses in the Green Springs area. The Burning Bush is a biannual theological journal published by the Far Eastern Bible College.  It contains theological papers, sermons, testimonies, book reviews, college news, and alumni reports.  Articles are indexed in the Christian Periodical Index.  The journal is distributed for free to students and alumni of the Far Eastern Bible College and Bible-Presbyterian churches, and is also available online.  The editor-in-chief is Jeffrey Khoo.  The journal was established in 1971 as a newsletter of the college.  In 1995 it was replaced with the present journal format to allow for longer articles such as term papers, graduate theses, and faculty write-ups.  The papers published reflect the reformed, premillennial, and separatist stance of the college. James Dewey Watson (born April 6, 1928) is an American molecular biologist, geneticist and zoologist, best known as one of the co-discoverers of the structure of DNA in 1953 with Francis Crick and Rosalind Franklin.  Watson, Crick, and Maurice Wilkins were awarded the 1962 Nobel Prize in Physiology or Medicine "for their discoveries concerning the molecular structure of nucleic acids and its significance for information transfer in living material".
Answer: the structure of DNA