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telegraph.co.uk
oB8JK
TIL During WWI, the MI6 discovered semen could work as invisible ink. Mansfield Cumming, the first chief of the SIS was "making enquiries for invisible inks," and apparently semen did not react to the main methods of detection. It also had the advantage of being readily available.
LkPpp
TIL that the actors of The Last of Us Part II could improvise their performances and were allowed up to 20 or 30 takes.
MeZaW
TIL that in 2015 a Hezbollah cell was caught stockpiling ammonium nitrate in London