Editing 2013 (section)

===May===
<!--[[File:Edward Snowden-2.jpg|thumb|[[Edward Snowden]] releases classified information on a global surveillance program to the public]]-->
* [[May 14]]–[[May 18|18]] – The [[Eurovision Song Contest 2013]] takes place in [[Malmö]], Sweden, and is won by [[Denmark in the Eurovision Song Contest|Danish]] entrant [[Emmelie de Forest]] with the song "[[Only Teardrops]]".
* [[May 15]]
**Researchers from [[Oregon Health & Science University]] in the United States describe the first production of human [[embryonic stem cell]]s by [[cloning]], in a study published in the scientific journal ''[[Nature (journal)|Nature]]''.<ref>{{cite news|url=http://www.nature.com/news/human-stem-cells-created-by-cloning-1.12983|title=Human stem cells created by cloning|last=Cyranoski|first=David|date=May 15, 2013|work=[[Nature (journal)|Nature]]|access-date=May 15, 2013|archive-date=February 16, 2019|archive-url=https://web.archive.org/web/20190216093235/http://www.nature.com/news/human-stem-cells-created-by-cloning-1.12983|url-status=live}}</ref>
**The [[World Health Organization]] names the novel coronavirus [[Middle East respiratory syndrome]] (MERS).<ref>{{cite web |title=Novel coronavirus update – new virus to be called MERS-CoV |url=https://www.euro.who.int/en/health-topics/communicable-diseases/influenza/news/news/2013/05/novel-coronavirus-update-new-virus-to-be-called-mers-cov |website=World Health Organization Regional Office for Europe |access-date=30 December 2020 |date=16 May 2013 |archive-date=October 10, 2015 |archive-url=https://web.archive.org/web/20151010085242/https://www.euro.who.int/en/health-topics/communicable-diseases/influenza/news/news/2013/05/novel-coronavirus-update-new-virus-to-be-called-mers-cov |url-status=live }}</ref>
* [[May 20]] – The [[2013 Moore tornado|latest EF5 tornado]] in the United States hits [[Moore, Oklahoma|Moore]] and several other surrounding areas near Oklahoma City, resulting in 24 deaths and many injuries.<ref>{{cite report|author=National Weather Service Weather Forecast Office in Norman, Oklahoma|title=Oklahoma Event Report: EF5 Tornado|url=https://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=451572|publisher=National Centers for Environmental Information|year=2013|access-date=May 11, 2018|archive-date=May 12, 2018|archive-url=https://web.archive.org/web/20180512113956/https://www.ncdc.noaa.gov/stormevents/eventdetails.jsp?id=451572|url-status=live}}</ref>  
* [[May 22]] – Off-duty [[British Army]] soldier [[Fusilier#United Kingdom|Fusilier]] [[Murder of Lee Rigby|Lee Rigby]] of the [[Royal Regiment of Fusiliers]] is murdered in [[Woolwich]], southeast [[London]], by Islamic terrorists Michael Adebolajo and Michael Adebowale.<ref>{{cite web|url=https://www.telegraph.co.uk/news/uknews/terrorism-in-the-uk/10085080/Lee-Rigby-murder-suspect-transferred-from-hospital-to-police-station.html|title=Lee Rigby murder suspect transferred from hospital to police station|first=Claire|last=Carter|date=May 28, 2013|work=The Daily Telegraph|access-date=April 18, 2019|archive-date=April 18, 2019|archive-url=https://web.archive.org/web/20190418050321/https://www.telegraph.co.uk/news/uknews/terrorism-in-the-uk/10085080/Lee-Rigby-murder-suspect-transferred-from-hospital-to-police-station.html|url-status=live}}</ref>
*[[May 31]] – The [[2013 El Reno tornado|largest tornado ever recorded]] hits [[El Reno]], United States. This rain-wrapped, [[multiple-vortex tornado]] was the [[Tornado records#Largest path width|widest tornado]] ever recorded, and results in eight deaths, including four storm-chasers. Measurements from mobile [[weather radar]]s revealed extreme winds up to 296&nbsp;mph (476&nbsp;km/h) within the vortex, among the highest observed wind speeds on [[Earth]]. As it crosses [[U.S. Route 81 in Oklahoma|U.S. 81]], the tornado grows to a record-breaking width of 2.6 miles (4.2&nbsp;km).<ref>{{cite news|title=Oklahoma storms: Amateur storm chaser took photo of tornado that killed him|url=https://www.oklahoman.com/story/news/columns/2013/06/03/oklahoma-storms-amateur-storm-chaser-took-photo-of-tornado-that-killed-him/60928721007/|author=Nolan Clay|newspaper=[[The Oklahoman]]|publisher=[[The Anschutz Corporation|Oklahoma Publishing Company]]|date=June 3, 2013|access-date=June 4, 2013|archive-url=https://web.archive.org/web/20220503150711/https://www.oklahoman.com/story/news/columns/2013/06/03/oklahoma-storms-amateur-storm-chaser-took-photo-of-tornado-that-killed-him/60928721007/|archive-date= May 3, 2022|url-status=live}}</ref>