A new book reveals that a member of MI6, the British spy agency, discovered during WWI that semen makes excellent invisible ink, and often deployed it in the field. The name of the man who discovered this? Mansfield Cumming. More »
British Intelligence Agency Used Semen as Invisible Ink [History]
A new book reveals that a member of MI6, the British spy agency, discovered during WWI that semen makes excellent invisible ink, and often deployed it in the field. The name of the man who discovered this? Mansfield Cumming. More »