The footnote can be found in the original article at https://www.quantamagazine.org/why-mathematicians-cant-find-the-hay-in-a-haystack-20180917/ https://www.qua

The footnote can be found in the original article at https://www.quantamagazine.org/why-mathematicians-cant-find-the-hay-in-a-haystack-20180917/ https://www.quantamagazine.org/why-mathematicians-cant-find-... The reason it’s 100 percent and not 99.9999 percent has to do with the strange things that happen once you start thinking about the probabilities when infinity is involved. Around the turn of the 20th century, the mathematician Henri Lebesque helped to develop “measure theory,” which provided a mathematically rigorous way for calculating the probabilities when infinite outcomes are possible.