Of course one can't be certain, but ...

@misc{healy2008of,
  author = {Healy, Kieran},
  title = {{Of course one can't be certain, but ...}},
  year = {2008},
  month = mar,
  howpublished = {kieranhealy.org},
  url = {https://kieranhealy.org/blog/archives/2008/03/24/of-course-one-cant-be-certain-but/},
  note = {Blog post, March 24, 2008}
}