May 20

Friday 20, 1983:

First publications of the discovery of the virus that causes AIDS in the journal Science by Luc Montagnierhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=6189183&query_hl=65 and Robert Gallohttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=6601823&query_hl=62 individually.

Monday 20, 1918:

For the third consecutive year on this date, the U.S. town of Codell, Kansas, is struck by a tornado.

Wednesday 20, 1570:

Cartographer Abraham Ortelius issues the first modern atlas.

Friday 20, 1521:

Battle of Pampeluna.

Wednesday 20, 1293:

King Sancho IV of Castile creates the Study of General Schools of Alcalá.

More on May, 20

• May, 20 in History
• People Born on May, 20
• They left us on May, 20