› added 6 years ago

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TIL The Fisher Pen Co. patented a sealed, pressurised ink cartridge for the anti-gravity pen in 1966. The "thixotropic” ink is close to a solid before being stirred & as it's stirred by the ball going through the point, it becomes very thin which allows it to flow in the gravity-free vacuum of space

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4X5Gg TIL Medical Doctors used to advertise and promote cigarettes
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