One gender, one birthday, simple...

As of the 23rd May 2022 this website is archived and will receive no further updates.

understandinguncertainty.org was produced by the Winton programme for the public understanding of risk based in the Statistical Laboratory in the University of Cambridge. The aim was to help improve the way that uncertainty and risk are discussed in society, and show how probability and statistics can be both useful and entertaining.

Many of the animations were produced using Flash and will no longer work.

My ex-wife has two sisters; they're twins, and their birthday is 9 April. I have one sister, whose birthday is also 9 April. I have three daughters, who have an easy task remembering family birthdays: one date, one gender. Apart from me (the father in the story), there has been a continuous trail of eight daughters, with no sons on either side of the family... I've long said that women are the future....
Total votes: 354
Date submitted:Sat, 14 Jan 2012 10:05:19 +0000Coincidence ID:3780