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http://www.telegraph.co.uk/men/the-filter/qi/10638792/QI-how-knitting-was-used-as-code-in-WW2.html
The Belgian resistance recruited old women whose windows overlooked railway yards to note the trains in their knitting. Basic stuff: purl one for this type of train, drop one for another type.
@StellaB is this featured in there?
@webmind A tale of two cities ❤️😃