These are the 6 blog posts written on May 13 of any year. (Nearby: May 12 and May 14.)
2019:
Coverage.py 5.0a5: pytest contexts #coverage
2008:
Blu’s Muto #animation
2005:
TiddlyWiki #javascript #tools
2004:
Distributed proofreaders #books
Reading fiction #books
2002:
LawMeme #blogs #law