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TIL British spymaster Sir Mansfield Smith-Cumming, the first head of the MI6 and the inspiration of James Bond's M, started the practice of using semen as invisible ink during WWI. It worked well, until they realised that the letters smelled awful when received.

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wLZdY TIL Facebook applied for a patent for a technology built to spy on users' reactions of content through their webcams/smartphone cameras and microphones without their knowledge
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