00:00 A segment explores mysterious numbers stations heard on shortwave radio, featuring discussions with experts like Timothy Ryback. The episode is sponsored by Quince clothing and Mint Mobile for better cellular plans in Canada.

02:10 A segment delves into mysterious nighttime number stations heard on shortwave radio that feature repetitive readings of seemingly random numbers.

04:11 A child during WWII heard mysterious nighttime number stations on shortwave radio that Austrian intelligence used to decode.

06:07 During WWII, children heard mysterious number stations on shortwave radio used by Austrian and later Soviet/Eastern Bloc intelligence.

08:31 During WWII, children listened to mysterious number stations on shortwave radio for secret intelligence communications using a theoretically uncrackable encryption method known as the one-time pad.

10:32 Children during WWII secretly listened to uncrackable encrypted messages via shortwave radio from mysterious number stations.

12:24 Children during WWII listened to encrypted messages from number stations via shortwave radio. Despite advancements in technology and cryptography, these broadcasts remain a curious open secret with unknown audiens today; they're still being made available online for anyone interested to listen using various digital platforms that mimic the original medium without revealing specific identities or locations of intended recipients.