TODO.md: add birthday paradox idea

1 files changed, 1 insertions, 0 deletions

diff --git a/TODO.md b/TODO.md
index 4e1a8d9..78da893 100644
--- a/TODO.md
+++ b/TODO.md
@@ -57,6 +57,7 @@ this stuff may not make any sense.
       content of paper itself
     * detailed results are interesting
 * my tools 2021 (vim, irssi, screen, mutt/offlineimap/notmuch, irb, git, bash)
+* birthday paradox
 
 ## done
 * add project folders