Microdots: The CIA's Tiny Secret-Message Holders - a podcast by Smithsonian Channel
from 2015-11-09T09:00
::
::
In 1971, the CIA sent coded messages to the Hanoi Hilton's prisoners of war through powdered-drink packages. How they hid these cryptic messages was quite ingenious.
The latest in science, culture, and history from Smithsonian Channel.
Further episodes of Smithsonian Channel Pick of the Week
Further podcasts by Smithsonian Channel
Website of Smithsonian Channel